September 2008 - Haskell-Cafe

two problems with Data.Binary and Data.ByteString
by Tim Newsham 05 Nov '08

05 Nov '08

I have a program that read in and populated a large data structure and then saved it out with Data.Binary and Data.ByteString.Lazy.Char8: saveState db = B.writeFile stateFile =<< encode <$> atomically (readTVar db) when I go to read this in later I get a stack overflow: loadState db = do d <- decode <$> B.readFile stateFile atomically $ writeTVar db d Stack space overflow: current size 8388608 bytes. Use `+RTS -Ksize' to increase it. or from ghci: d <- liftM decode (Data.ByteString.Lazy.Char8.readFile "savedState.bin") :: IO InstrsDb fromList *** Exception: stack overflow The data type I'm storing is a Map (of maps): type DailyDb = M.Map Date Daily type InstrsDb = M.Map String DailyDb What's going on here? Why is the system capable of building and saving the data but not in reading and umarhsalling it? What is the proper way to track down where the exception is happening? Any debugging tips? I also noticed another issue while testing. If my program loads the data at startup by calling loadState then all later calls to saveState give an error: Log: savedState.bin: openFile: resource busy (file is locked) this does not occur if the program wasnt loaded. My best guess here is that B.readFile isnt completing and closing the file for some reason. Is there a good way to force this? Tim Newsham http://www.thenewsh.com/~newsham/

10 49

Network.FastCGI does not emit stderr outputs to lighttpd's error.log?
by Agent Zhang 04 Nov '08

04 Nov '08

Hi, I'm trying Network.FastCGI + lighttpd 1.4.9 to develop a RESTful service platform. I've found that stderr (especially those from Debug.Trace) get lost in the error.log file. But plain CGI mode with Network.CGI works perfectly (all stderr outputs appear in error.log). Besides, my Perl fastcgi script also logs stderr with the same lighttpd. So it does seem that my lighttpd's mod_fastcgi module is OK. Is this a known issue in the Haskell fastcgi library? Is there a workaround or a fix? Thanks in advance :) Cheers, -agentzh

3 4

Is there already an abstraction for this?
by Jeremy Shaw 20 Oct '08

20 Oct '08

Hello, I am trying to figure out if there is an existing abstraction I am missing here. I have an expression data-type: > data Expr > = Quotient Expr Expr > | Product Expr Expr > | Sum Expr Expr > | Difference Expr Expr > | Lit Double > | Var Char > deriving (Eq, Ord, Data, Typeable, Read, Show) > And I want to write a function that will take an expression and automatically apply the identity laws to simplify the expression. The basic identity laws are: a + 0 = a a * 1 = a I can implement these with some 'sugar' as: > identity (Sum (Lit 0) a) = a > identity (Sum a (Lit 0)) = a > identity (Difference a (Lit 0)) = a > identity (Product a (Lit 1)) = a > identity (Product (Lit 1) a) = a > identity (Quotient a (Lit 1)) = a > identity a = a This works fine when the identity only needs to be applied to the root of the expression tree: *Main> ppExpr $ identity (expr "1 + 0") 1 But for more complicated trees it does not fully apply the identity laws: *Main> ppExpr $ identity (expr "0 + (0 + 0) + (0 + 0)") ((0 + 0) + (0 + 0)) What we need to do is first apply the identity function to the children, and then apply them to the parent of the updated children. A first attempt would be to extend the identity function like this: > identity (Sum a b) = identity (Sum (identity a) (identity b)) However, that will not terminate because that same case will keep matching over and over. Another approach is to have two mutually recursive functions like: > identity' (Sum (Lit 0) a) = identityRec a > identity' (Sum a (Lit 0)) = identityRec a > identity' a = a > identityRec (Sum a b) = identity' (Sum (identity' a) (identity' b)) This prevents non-termination, but you have to be careful about calling identity' vs identityRec or you will either re-introduce non-termination, or you may not fully apply the identity laws. Another option to create a helper function like: > -- |Deep map of an expression. > eMap :: (Expr -> Expr) -> Expr -> Expr > eMap f (Sum a b) = f (Sum (eMap f a) (eMap f b)) > eMap f (Difference a b) = f (Difference (eMap f a) (eMap f b)) > eMap f (Product a b) = f (Product (eMap f a) (eMap f b)) > eMap f (Quotient a b) = f (Quotient (eMap f a) (eMap f b)) > eMap f (Var v) = f (Var v) > eMap f (Lit i) = f (Lit i) Now we can easily apply the identity law recursively like: > deepIdentity :: Expr -> Expr > deepIdentity = eMap identity *Main> ppExpr (deepIdentity (expr "0 + (0 + 0) + (0 + 0)")) 0 Sweet! But, having to write eMap out by hand like that somehow feels wrong -- as if I am missing some additional abstraction. In some respects eMap is like a Functor, but not quite. I expect there is a way to implement eMap using Data.Generics, which is perhaps better, but I still feel like that is missing something? Anyway, I just thought I would ask in case someone recognized this pattern and could point me in the right direction. I have attached a working example program you can play with. I would also be interested in alternative approaches besides the ones I outlined. thanks! j. >{-# LANGUAGE DeriveDataTypeable #-} > > import Control.Applicative (Applicative((<*>), pure), (*>), (<*)) > import Control.Monad (ap) > import Data.Generics (Typeable, Data) > import Data.List (isSuffixOf) > import Text.ParserCombinators.Parsec ((<|>)) > import qualified Text.ParserCombinators.Parsec as P > import qualified Text.ParserCombinators.Parsec.Expr as P > import Text.PrettyPrint.HughesPJ ((<+>)) > import qualified Text.PrettyPrint.HughesPJ as H > import Prelude hiding (sum, product) > > data Expr > = Quotient Expr Expr > | Product Expr Expr > | Sum Expr Expr > | Difference Expr Expr > | Lit Double > | Var Char > deriving (Eq, Ord, Data, Typeable, Read, Show) > > instance Applicative (P.GenParser token state) where > pure = return > (<*>) = ap > > parseExpr :: P.GenParser Char st Expr > parseExpr = P.buildExpressionParser optable (lit <|> var <|> parenExpr) > where > parenExpr = > (P.char '(' >> P.skipMany P.space) *> parseExpr <* (P.char ')' >> P.skipMany P.space) > optable = > [ [ P.Infix (P.char '/' >> P.skipMany P.space >> return Quotient) P.AssocLeft ] > , [ P.Infix (P.char '*' >> P.skipMany P.space >> return Product) P.AssocRight ] > , [ P.Infix (P.char '+' >> P.skipMany P.space >> return Sum) P.AssocRight ] > , [ P.Infix (P.char '-' >> P.skipMany P.space >> return Difference) P.AssocLeft ] > ] > lit = > do d <- P.try (P.many1 $ P.oneOf ('-' : '.' : ['0'..'9'])) > P.skipMany P.space > return (Lit (read d)) > var = > do sign <- (P.char '-' >> return (\x -> (Product (Lit (-1)) x))) <|> (return id) > v <- (P.upper <|> P.lower) > P.skipMany P.space > return (sign (Var v)) > > expr :: String -> Expr > expr str = either (error .show) id (P.parse parseExpr str str) > > ppExpr :: Expr -> H.Doc > ppExpr (Lit i) = H.text (let f s = if isSuffixOf ".0" s then init(init s) else s in f $ show i) > ppExpr (Var v) = H.char v > ppExpr (Quotient x y) = H.parens (ppExpr x <+> H.char '/' <+> ppExpr y) > ppExpr (Product x y) = H.parens (ppExpr x <+> H.char '*' <+> ppExpr y) > ppExpr (Sum x y) = H.parens (ppExpr x <+> H.char '+' <+> ppExpr y) > ppExpr (Difference x y) = H.parens (ppExpr x <+> H.char '-' <+> ppExpr y) > -- |Deep map of an expression. > eMap :: (Expr -> Expr) -> Expr -> Expr > eMap f (Sum a b) = f (Sum (eMap f a) (eMap f b)) > eMap f (Difference a b) = f (Difference (eMap f a) (eMap f b)) > eMap f (Product a b) = f (Product (eMap f a) (eMap f b)) > eMap f (Quotient a b) = f (Quotient (eMap f a) (eMap f b)) > eMap f (Var v) = f (Var v) > eMap f (Lit i) = f (Lit i) > identity (Sum (Lit 0) a) = a > identity (Sum a (Lit 0)) = a > identity (Difference a (Lit 0)) = a > identity (Product a (Lit 1)) = a > identity (Product (Lit 1) a) = a > identity (Quotient a (Lit 1)) = a > identity a = a > deepIdentity :: Expr -> Expr > deepIdentity = eMap identity > test :: IO () > test = > do print (ppExpr (deepIdentity (expr "1 + 2"))) > print (ppExpr (deepIdentity (expr "0 + (0 + 0) + (0 + 0)")))

11 12

HDBC or HSQL
by George Moschovitis 19 Oct '08

19 Oct '08

Dear devs, I am a Haskell newbie and I would like to hear your suggestions regarding a Database conectivity library: HSQL or HDBC ? which one is better / more actively supported? thanks in advance, -g. -- http://phidz.com http://blog.gmosx.com http://cull.gr http://www.joy.gr http://nitroproject.org

15 25

External Sort and unsafeInterleaveIO
by Ben 11 Oct '08

11 Oct '08

hi folks -- a haskell newbie here, searching for comments and wisdom on my code. i had a project to try to implement "external sort" in haskell as a learning exercise. (external sort is sorting a list that is too large to fit in main memory, by sorting in chunks, spooling to disk, and then merging. more properly there probably should be multiple stages, but for simplicity i'm doing a one-stage external sort.) the trick is the number of files can quickly grow very large, so it is best to use one large file and seek inside it around. however as one can imagine the order-of-IO-operations becomes a bit tricky, if you're seeking file handles around underneath Data.ByteString.Lazy's nose. but late this night after not thinking about it for a while i had a brainstorm: rewrite hGetContents to keep the handle position in the right place! it's all about judicious use of unsafeInterleaveIO..... it seems to be rather fast, strangely faster than the usual "sort" at times. it also seems to have nice memory characteristics, though not perfect. it's hard to test because the normal "sort" function takes too much RAM on large lists, making my computer swap like mad. i'd appreciate any testing, comments and suggestions from the haskell gods out there. my thanks to the Data.ByteString.Lazy, Data.Binary, and Data.Edison people, who made this rather easy, once I grokked unsafeInterleaveIO. thanks and take care, B > module ExternalSort where Sort a list of Ords "offline." We're doing this to be able to sort things without taking up too much memory (for example sorting lists too large to fit in RAM.) Laziness is imperative, as is the order-of-operations. > import Control.Monad > import Data.List > import qualified Data.Binary as Bin > import qualified Data.ByteString.Lazy as B > import qualified Data.ByteString as P (hGetNonBlocking, null) > import Data.ByteString.Base (LazyByteString(LPS)) > import Foreign.Storable (sizeOf) > import System.IO (openFile, hClose, hSeek, hTell, hIsEOF, hWaitForInput, > Handle, IOMode(ReadMode, WriteMode), > SeekMode(AbsoluteSeek)) > import System.IO.Unsafe (unsafeInterleaveIO) > > import qualified Data.Edison.Seq.ListSeq as LS > import qualified Data.Edison.Coll.SplayHeap as Splay Conceptually, we sort a list in blocks, spool blocks to disk, then merge back. However for IO performance it is better to read off chunks of elements off the sorted blocks from disk instead of elements-at-a-time. It would be better if these were in KBytes instead of # of elements. > blocksize :: Int > blocksize = 10000 Turn a list into a list of chunks. > slice :: Int -> [a] -> [[a]] > slice _ [] = [] > slice size l = (take size l) : (slice size $ drop size l) Turn a list into a list of blocks, each of which is sorted. > blockify :: (Ord a) => Int -> [a] -> [[a]] > blockify bsize l = map sort $ slice bsize l Serialize a block, returning the (absolute) position of the start. > dumpBlock :: (Ord a, Bin.Binary a) => Handle -> [a] -> IO Integer > dumpBlock h b = do > start <- hTell h > B.hPut h $ Bin.encode b > return start The actual sorting function. We blockify the list, turning it into a list of sorted blocks, and spool to disk, keeping track of offsets. We then read back the blocks (lazily!), and merge them. > externalSort [] = do return [] > externalSort l = do > h <- openFile "ExternalSort.bin" WriteMode > idx <- mapM (\x -> dumpBlock h x) (blockify blocksize l) > hClose h > h <- openFile "ExternalSort.bin" ReadMode > blocks <- mapM (\x -> do {bs <- hGetContentsWithCursor h x; > return $ Bin.decode bs}) idx > return (kMerge $ blocks) Merging chunks. K-way merge (and in fact external sort in general) is detailed in Knuth, where he recommends tournament trees. The easiest thing is to probably use one of Okasaki's heaps. I'll use splay heaps, because I don't know any better. It would be better if I changed Ord for blocks to only check the first element. > kMerge :: (Ord a) => [[a]] -> [a] > kMerge [] = [] > kMerge l = > let h = Splay.fromSeq l in > kM (Splay.minElem h) (Splay.deleteMin h) > where > kM :: (Ord a) => [a] -> Splay.Heap [a] -> [a] > kM l h > | h == Splay.empty = l > | otherwise = > let next = Splay.minElem h > (f, b) = span (\x -> x <= head next) l > in > f ++ (kM next (if null b then Splay.deleteMin h > else (Splay.insert b $ Splay.deleteMin h))) > > kMergeSort :: (Ord a) => [a] -> [a] > kMergeSort l = kMerge $ blockify blocksize l This is a version of hGetContents which resets its handle position between reads, so is safe to use with interleaved handle seeking. > hGetContentsWithCursor :: Handle -> Integer -> IO B.ByteString > hGetContentsWithCursor = hGetContentsWithCursorN defaultChunkSize > > hGetContentsWithCursorN :: Int -> Handle -> Integer -> IO B.ByteString > hGetContentsWithCursorN k h start = (lazyRead start) >>= return . LPS > where > lazyRead start = unsafeInterleaveIO $ loop start > > loop start = do > hSeek h AbsoluteSeek start > ps <- P.hGetNonBlocking h k > --TODO: I think this should distinguish EOF from no data available > -- the otherlying POSIX call makes this distincion, returning either > -- 0 or EAGAIN > if P.null ps > then do eof <- hIsEOF h > if eof then return [] > else hWaitForInput h (-1) > >> (loop start) > else do > pos <- hTell h > pss <- lazyRead pos > return (ps : pss) > > defaultChunkSize :: Int > defaultChunkSize = 32 * k - overhead > where k = 1024 > overhead = 2 * sizeOf (undefined :: Int)

5 6

compiling ghc-6.8.3: unrecognized command line option "-fconfigure-option=" (SOLVED)
by Poor Yorick 10 Oct '08

10 Oct '08

For anyone who might experience the same problem... Intalling ghc-6.8.3, the following error occurred: make -C libraries all make[1]: Entering directory `/path/to/src/gh c-6.8.3/ghc-6.8.3/libraries' rm -f -f stamp/configure.library.*.base base/unbuildable ( cd base && setup/Setup configure \ --enable-library-profiling --enable-split-objs \ --prefix=/NONEXISTANT \ --bindir=/NONEXISTANT \ --libdir=/NONEXISTANT \ --libsubdir='$pkgid' \ --libexecdir=/NONEXISTANT \ --datadir=/NONEXISTANT \ --docdir=/NONEXISTANT \ --htmldir=/NONEXISTANT \ --interfacedir=/NONEXISTANT \ --with-compiler=../../compiler/stage1/ghc-inplace \ --with-hc-pkg=../../utils/ghc-pkg/ghc-pkg-inplace \ --with-hsc2hs=../../utils/hsc2hs/hsc2hs-inplace \ --with-ld=/path/to/bin/ld \ --haddock-options="--use-contents=../index.html \ --use-index=../doc-index.html" \ --configure-option='--prefix=/path/to/ghc-6.8.3' --configure-option='CC=gcc -m32' --configure-option='LDFLAGS=-Wl,-rpath,/path/to/lib -Wl,-rpath,/path/to/lib64 -Wl,--enable-new-dtags -L/path/to/lib -L/path/to/lib64 --configure-option=' --configure-option='CPPFLAGS=-I/path/to/include --configure-option=' \ --configure-option=--with-cc=gcc ) \ && touch stamp/configure.library.build-profiling-splitting.base || touch base/unbuildable Configuring base-3.0.2.0... configure: WARNING: Unrecognized options: --with-hc, --with-hc-pkg checking for gcc... gcc checking for C compiler default output file name... configure: error: C compiler cannot create executables See `config.log' for more details. config.log showed this: configure:2171: checking for C compiler default output file name configure:2193: gcc -I/path/to/include --configure-option= -Wl,-rpath,/path/to/lib -Wl,-rpath,/path/to/lib64 -Wl,--enable-new-dtags -L/path/to/lib -L/path/to/lib64 --configure-option= conftest.c >&5 cc1: error: unrecognized command line option "-fconfigure-option=" cc1: error: unrecognized command line option "-fconfigure-option=" configure:2197: $? = 1 configure:2235: result: configure: failed program was: | /* confdefs.h. */ | #define PACKAGE_NAME "Haskell base package" | #define PACKAGE_TARNAME "base" | #define PACKAGE_VERSION "1.0" | #define PACKAGE_STRING "Haskell base package 1.0" | #define PACKAGE_BUGREPORT "libraries(a)haskell.org" | /* end confdefs.h. */ | | int | main () | { | | ; | return 0; | } configure:2242: error: C compiler cannot create executables See `config.log' for more details. ## ---------------- ## ## Cache variables. ## ## ---------------- ## ac_cv_env_CC_set=set ac_cv_env_CC_value='gcc -m32' ac_cv_env_CFLAGS_set= ac_cv_env_CFLAGS_value= ac_cv_env_CPPFLAGS_set=set ac_cv_env_CPPFLAGS_value='-I/path/to/include --configure-option=' ac_cv_env_CPP_set= ac_cv_env_CPP_value= ac_cv_env_LDFLAGS_set=set ac_cv_env_LDFLAGS_value='-Wl,-rpath,/path/to/lib -Wl,-rpath,/path/to/lib64 -Wl,--enable-new-dtags -L/path/to/lib -L/path/to/lib64 --configure-option=' ac_cv_env_LIBS_set= ac_cv_env_LIBS_value= ac_cv_env_build_alias_set= ac_cv_env_build_alias_value= ac_cv_env_host_alias_set= ac_cv_env_host_alias_value= ac_cv_env_target_alias_set= ac_cv_env_target_alias_value= ac_cv_prog_ac_ct_CC=gcc ## ----------------- ## ## Output variables. ## ## ----------------- ## CC='gcc' CFLAGS='' CPP='' CPPFLAGS='-I/path/to/include --configure-option=' DEFS='' ECHO_C='' ECHO_N='-n' ECHO_T='' EGREP='' EXEEXT='' GREP='' LDFLAGS='-Wl,-rpath,/path/to/lib -Wl,-rpath,/path/to/lib64 -Wl,--enable-new-dtags -L/path/to/lib -L/path/to/lib64 --configure-option=' LIBOBJS='' LIBS='' LTLIBOBJS='' OBJEXT='' PACKAGE_BUGREPORT='libraries(a)haskell.org' PACKAGE_NAME='Haskell base package' PACKAGE_STRING='Haskell base package 1.0' PACKAGE_TARNAME='base' PACKAGE_VERSION='1.0' PATH_SEPARATOR=':' SHELL='/bin/sh' ac_ct_CC='gcc' bindir='/NONEXISTANT' build_alias='' datadir='/NONEXISTANT' datarootdir='${prefix}/share' docdir='${datarootdir}/doc/${PACKAGE_TARNAME}' dvidir='${docdir}' exec_prefix='NONE' host_alias='' htmldir='${docdir}' includedir='${prefix}/include' infodir='${datarootdir}/info' libdir='/NONEXISTANT' libexecdir='/NONEXISTANT' localedir='${datarootdir}/locale' localstatedir='${prefix}/var' mandir='${datarootdir}/man' oldincludedir='/usr/include' pdfdir='${docdir}' prefix='/path/to/ghc-6.8.3' program_transform_name='s,x,x,' psdir='${docdir}' sbindir='${exec_prefix}/sbin' sharedstatedir='${prefix}/com' sysconfdir='${prefix}/etc' target_alias='' It turned out that trailing whitespace in the LDFLAGS and CPPFLAGS environment variables were causing these problems. see libraries/Makfile: # We rely on all the CONFIGURE_ARGS being quoted with '...', and there # being no 's inside the values. FLAGGED_CONFIGURE_ARGS = $(subst $(space)',\ $(space)--configure-option=',\ $(space)$(CONFIGURE_ARGS)) -- Yorick

5 4

Linker Errors For OpenGL / GLUT 'Hello World' Program.
by Donnie Jones 09 Oct '08

09 Oct '08

Hello, I am trying to test do some OpenGL / GLUT programming in Haskell, but I had linker issues testing the 'Hello World' OpenGL Haskell program. I believe the linker issues were caused because the Haskell GLUT package couldn't find the GLUT C libraries that were installed with Debian packages. I have tested that my OpenGL install does work with 'glxgears'. Below I have included the output from building Hello.hs with the linker errors, my Cabal install of GLUT and OpenGL (which seemed to install fine and the 'configure' stage of the package installs seem to find the OpenGL and GLUT C-libraries), and the Debian packages I have installed which provide the C-libraries for OpenGL and GLUT. Sorry for the long post, but I wanted to include all relevant information. Any help would be greatly appreciated. :) Thank you. __ Donnie ### Hello.hs ### import Graphics.Rendering.OpenGL import Graphics.UI.GLUT main = do (progname, _) <- getArgsAndInitialize createWindow "Hello World" mainLoop ########### ### Build of Haskell OpenGL / GLUT "Hello World" program, linking fails ### ghc --make Hello1.hs [1 of 1] Compiling Main ( Hello1.hs, Hello1.o ) Linking Hello1 ... /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Begin.o): In function `sAlI_info': (.text+0x1d3): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Begin.o): In function `sAxK_info': (.text+0x84f): undefined reference to `glutMainLoop' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Global.o): In function `szMM_info': (.text+0xd): undefined reference to `glutMenuStatusFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Global.o): In function `szNf_info': (.text+0x4d): undefined reference to `glutIdleFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Global.o): In function `szUK_info': (.text+0x6ac): undefined reference to `glutTimerFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `sshz_info': (.text+0x549): undefined reference to `glutEntryFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `ssi2_info': (.text+0x589): undefined reference to `glutVisibilityFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `ssiv_info': (.text+0x5c9): undefined reference to `glutPassiveMotionFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `ssiY_info': (.text+0x609): undefined reference to `glutMotionFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `ssjr_info': (.text+0x649): undefined reference to `glutReshapeFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `ssjU_info': (.text+0x689): undefined reference to `glutOverlayDisplayFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `sskn_info': (.text+0x6c9): undefined reference to `glutDisplayFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `stBW_info': (.text+0x4f95): undefined reference to `glutKeyboardFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `stCp_info': (.text+0x4fd5): undefined reference to `glutKeyboardUpFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `stGi_info': (.text+0x52e1): undefined reference to `glutSpecialFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `stGL_info': (.text+0x5321): undefined reference to `glutSpecialUpFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `stJk_info': (.text+0x5515): undefined reference to `glutMouseFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `stQq_info': (.text+0x5a91): undefined reference to `glutSpaceballMotionFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `stRv_info': (.text+0x5b31): undefined reference to `glutSpaceballRotateFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `stTt_info': (.text+0x5cad): undefined reference to `glutSpaceballButtonFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `stYd_info': (.text+0x6121): undefined reference to `glutButtonBoxFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `stZi_info': (.text+0x61c5): undefined reference to `glutDialsFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `su3u_info': (.text+0x6589): undefined reference to `glutTabletMotionFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `su6w_info': (.text+0x680d): undefined reference to `glutTabletButtonFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `sudL_info': (.text+0x6ea1): undefined reference to `glutJoystickFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `ss3L_info': (.text+0xfca5): undefined reference to `glutGetModifiers' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `ss4i_info': (.text+0xfda5): undefined reference to `glutGetModifiers' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `ss4Q_info': (.text+0xfea5): undefined reference to `glutGetModifiers' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `ss5o_info': (.text+0xffa5): undefined reference to `glutGetModifiers' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `ss5Y_info': (.text+0x100a5): undefined reference to `glutGetModifiers' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Colormap.o): In function `snyp_info': (.text+0x50): undefined reference to `glutSetColor' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Colormap.o): In function `snyr_info': (.text+0x1ac): undefined reference to `glutGetColor' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Colormap.o): In function `snyr_info': (.text+0x1d6): undefined reference to `glutGetColor' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Colormap.o): In function `snyr_info': (.text+0x200): undefined reference to `glutGetColor' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Colormap.o): In function `snwY_info': (.text+0x313): undefined reference to `glutLayerGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Colormap.o): In function `snwY_info': (.text+0x353): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Colormap.o): In function `snCI_info': (.text+0x41d): undefined reference to `glutCopyColormap' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(DeviceControl.o): In function `smEq_info': (.text+0x19): undefined reference to `glutIgnoreKeyRepeat' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(DeviceControl.o): In function `smEq_info': (.text+0x2f): undefined reference to `glutIgnoreKeyRepeat' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(DeviceControl.o): In function `smF1_info': (.text+0x7a): undefined reference to `glutSetKeyRepeat' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(DeviceControl.o): In function `smF1_info': (.text+0x93): undefined reference to `glutSetKeyRepeat' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(DeviceControl.o): In function `smF1_info': (.text+0xb1): undefined reference to `glutSetKeyRepeat' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(DeviceControl.o): In function `smzT_info': (.text+0x1fb): undefined reference to `glutDeviceGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(DeviceControl.o): In function `smA6_info': (.text+0x27b): undefined reference to `glutDeviceGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(DeviceControl.o): In function `smA6_info': (.text+0x479): undefined reference to `glutForceJoystickFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Fonts.o): In function `slEn_info': (.text+0x519): undefined reference to `glutStrokeCharacter' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Fonts.o): In function `slFU_info': (.text+0x609): undefined reference to `glutStrokeLength' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Fonts.o): In function `slIT_info': (.text+0x8fc): undefined reference to `glutBitmapCharacter' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Fonts.o): In function `slL0_info': (.text+0xa25): undefined reference to `glutBitmapLength' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(GameMode.o): In function `siGD_info': (.text+0x278): undefined reference to `glutGameModeGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(GameMode.o): In function `siGD_info': (.text+0x2bb): undefined reference to `glutGameModeGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(GameMode.o): In function `siGD_info': (.text+0x2e7): undefined reference to `glutGameModeGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(GameMode.o): In function `siGD_info': (.text+0x2f9): undefined reference to `glutGameModeGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(GameMode.o): In function `siGD_info': (.text+0x30b): undefined reference to `glutGameModeGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(GameMode.o):(.text+0x31d): more undefined references to `glutGameModeGet' follow /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(GameMode.o): In function `siHQ_info': (.text+0x3ed): undefined reference to `glutEnterGameMode' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(GameMode.o): In function `siHQ_info': (.text+0x3fc): undefined reference to `glutGameModeGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(GameMode.o): In function `sjqd_info': (.text+0x13c5): undefined reference to `glutGameModeString' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(GameMode.o): In function `siNC_info': (.text+0x2131): undefined reference to `glutLeaveGameMode' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Initialization.o):(.text+0x15): undefined reference to `glutInitWindowSize' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Initialization.o):(.text+0x3d): undefined reference to `glutInitWindowPosition' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Initialization.o): In function `sfcH_info': (.text+0x24f): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Initialization.o): In function `sfdf_info': (.text+0x45b): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Initialization.o): In function `sfdf_info': (.text+0x49b): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Initialization.o): In function `sfdf_info': (.text+0x4ad): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Initialization.o): In function `sfdf_info': (.text+0x50f): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Initialization.o):(.text+0x521): more undefined references to `glutGet' follow /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Initialization.o): In function `sfiu_info': (.text+0x2f40): undefined reference to `glutInitDisplayMode' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Initialization.o): In function `sgtU_info': (.text+0x2fc1): undefined reference to `glutInitDisplayString' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Initialization.o): In function `sfwB_info': (.text+0x63e1): undefined reference to `glutInit' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `syIX_info': (.text+0xdf): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `ryuS_info': (.text+0x173): undefined reference to `glutRemoveMenuItem' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `syRu_info': (.text+0x6e1): undefined reference to `glutAddMenuEntry' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `syRj_info': (.text+0x7b9): undefined reference to `glutAddSubMenu' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `syzf_info': (.text+0x83b): undefined reference to `glutRemoveMenuItem' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `syRh_info': (.text+0x951): undefined reference to `glutSetMenu' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `syRf_info': (.text+0x9b2): undefined reference to `glutGetMenu' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `syRQ_info': (.text+0xd7d): undefined reference to `glutDestroyMenu' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `syRN_info': (.text+0xe49): undefined reference to `glutCreateMenu' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `szk6_info': (.text+0x1a86): undefined reference to `glutAttachMenu' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `szk6_info': (.text+0x1a9f): undefined reference to `glutAttachMenu' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `szk6_info': (.text+0x1ab8): undefined reference to `glutAttachMenu' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `szk6_info': (.text+0x1ad1): undefined reference to `glutAttachMenu' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `szk6_info': (.text+0x1aea): undefined reference to `glutAttachMenu' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `syHN_info': (.text+0x1d54): undefined reference to `glutDetachMenu' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Menu.o): In function `szjX_info': (.text+0x1e79): undefined reference to `glutGetWindow' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `raiR_info': (.text+0xe39): undefined reference to `glutSolidDodecahedron' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `raiP_info': (.text+0xe55): undefined reference to `glutWireDodecahedron' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `raiN_info': (.text+0xe71): undefined reference to `glutWireIcosahedron' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `raiL_info': (.text+0xe8d): undefined reference to `glutSolidIcosahedron' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `raiJ_info': (.text+0xea9): undefined reference to `glutSolidOctahedron' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `raiH_info': (.text+0xec5): undefined reference to `glutWireOctahedron' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `raiF_info': (.text+0xee1): undefined reference to `glutWireTetrahedron' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `raiD_info': (.text+0xefd): undefined reference to `glutSolidTetrahedron' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `sdiu_info': (.text+0x5026): undefined reference to `glutSolidCube' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `sdir_info': (.text+0x50c6): undefined reference to `glutSolidSphere' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `sdim_info': (.text+0x51e7): undefined reference to `glutSolidCone' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `sdi9_info': (.text+0x54cf): undefined reference to `glutSolidTorus' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `sdi3_info': (.text+0x5622): undefined reference to `glutSolidTeapot' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `sdhV_info': (.text+0x58fe): undefined reference to `glutWireCube' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `sdhS_info': (.text+0x599e): undefined reference to `glutWireSphere' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `sdhN_info': (.text+0x5abf): undefined reference to `glutWireCone' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `sdhA_info': (.text+0x5da7): undefined reference to `glutWireTorus' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Objects.o): In function `sdhu_info': (.text+0x5efa): undefined reference to `glutWireTeapot' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Overlay.o): In function `s8A7_info': (.text+0x61): undefined reference to `glutUseLayer' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Overlay.o): In function `s8A7_info': (.text+0xcf): undefined reference to `glutUseLayer' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Overlay.o): In function `s8ws_info': (.text+0x227): undefined reference to `glutLayerGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Overlay.o): In function `s8D9_info': (.text+0x2ac): undefined reference to `glutPostWindowOverlayRedisplay' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Overlay.o): In function `s8D8_info': (.text+0x326): undefined reference to `glutPostOverlayRedisplay' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Overlay.o): In function `s8x0_info': (.text+0x3ff): undefined reference to `glutLayerGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Overlay.o): In function `s8FF_info': (.text+0x482): undefined reference to `glutRemoveOverlay' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Overlay.o): In function `s8FF_info': (.text+0x4e7): undefined reference to `glutEstablishOverlay' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Overlay.o): In function `s8xt_info': (.text+0x5a7): undefined reference to `glutLayerGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Overlay.o): In function `s8HX_info': (.text+0x62a): undefined reference to `glutHideOverlay' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Overlay.o): In function `s8HX_info': (.text+0x68f): undefined reference to `glutShowOverlay' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o): In function `s9EB_info': (.text+0x49): undefined reference to `glutDeviceGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o): In function `s9EB_info': (.text+0x8f): undefined reference to `glutDeviceGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o): In function `s9EB_info': (.text+0xa1): undefined reference to `glutDeviceGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o): In function `s9EB_info': (.text+0xb3): undefined reference to `glutDeviceGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o): In function `s9EB_info': (.text+0x12b): undefined reference to `glutDeviceGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o):(.text+0x16b): more undefined references to `glutDeviceGet' follow /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o): In function `s9EB_info': (.text+0x363): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o): In function `s9EB_info': (.text+0x3a3): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o): In function `s9L1_info': (.text+0xb93): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o): In function `s9yO_info': (.text+0xcbb): undefined reference to `glutDeviceGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o): In function `s9z1_info': (.text+0xd3b): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o): In function `s9ze_info': (.text+0xdbb): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o): In function `s9zr_info': (.text+0xe3b): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o): In function `s9zr_info': (.text+0xe7b): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o): In function `s9zr_info': (.text+0xe8d): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o):(.text+0xeef): more undefined references to `glutGet' follow /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(State.o): In function `s9CY_info': (.text+0x12b8): undefined reference to `glutLayerGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o):(.text+0x15): undefined reference to `glutWarpPointer' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o):(.text+0x3d): undefined reference to `glutReshapeWindow' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o):(.text+0x65): undefined reference to `glutPositionWindow' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o):(.text+0xc5): undefined reference to `glutCreateSubWindow' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5kf_info': (.text+0x10a): undefined reference to `glutSetCursor' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5kf_info': (.text+0x123): undefined reference to `glutSetCursor' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5kf_info': (.text+0x13c): undefined reference to `glutSetCursor' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5kf_info': (.text+0x155): undefined reference to `glutSetCursor' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5kf_info': (.text+0x16e): undefined reference to `glutSetCursor' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o):(.text+0x187): more undefined references to `glutSetCursor' follow /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s56X_info': (.text+0x6eb): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s56X_info': (.text+0x72b): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s56X_info': (.text+0x73d): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s56X_info': (.text+0x79f): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s56X_info': (.text+0x7b1): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5p7_info': (.text+0x805): undefined reference to `glutSetWindow' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s58d_info': (.text+0x8e5): undefined reference to `glutGetWindow' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5qr_info': (.text+0x915): undefined reference to `glutPostWindowRedisplay' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5qq_info': (.text+0x93b): undefined reference to `glutPostRedisplay' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s59A_info': (.text+0xbc7): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s59A_info': (.text+0xc07): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5vb_info': (.text+0xc3f): undefined reference to `glutShowWindow' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5vb_info': (.text+0xc4f): undefined reference to `glutIconifyWindow' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5vb_info': (.text+0xc64): undefined reference to `glutHideWindow' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5Lh_info': (.text+0x190d): undefined reference to `glutCreateWindow' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5Mh_info': (.text+0x19a5): undefined reference to `glutDestroyWindow' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5Mh_info': (.text+0x19e5): undefined reference to `glutSwapBuffers' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5Mh_info': (.text+0x1a01): undefined reference to `glutFullScreen' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5Mh_info': (.text+0x1a1d): undefined reference to `glutPushWindow' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5Mh_info': (.text+0x1a39): undefined reference to `glutPopWindow' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5NA_info': (.text+0x1a55): undefined reference to `glutSetWindowTitle' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Window.o): In function `s5Oy_info': (.text+0x1add): undefined reference to `glutSetIconTitle' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Registration.o): In function `s7aX_info': (.text+0x2dd): undefined reference to `glutGetWindow' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Registration.o): In function `s7xG_info': (.text+0x7c3): undefined reference to `glutTimerFunc' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Registration.o): In function `s7lI_info': (.text+0x1ec0): undefined reference to `glutGetWindow' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(QueryUtils.o): In function `s1cg_info': (.text+0x61): undefined reference to `glutDeviceGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(QueryUtils.o): In function `s1d7_info': (.text+0x121): undefined reference to `glutLayerGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(QueryUtils.o): In function `s1dY_info': (.text+0x1e1): undefined reference to `glutGet' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(HsGLUT.o): In function `hs_GLUT_marshalBitmapFont': HsGLUT.c:(.text+0x15): undefined reference to `glutBitmap8By13' HsGLUT.c:(.text+0x24): undefined reference to `glutBitmapHelvetica18' HsGLUT.c:(.text+0x2b): undefined reference to `glutBitmap9By15' HsGLUT.c:(.text+0x32): undefined reference to `glutBitmapTimesRoman10' HsGLUT.c:(.text+0x39): undefined reference to `glutBitmapTimesRoman24' HsGLUT.c:(.text+0x40): undefined reference to `glutBitmapHelvetica10' HsGLUT.c:(.text+0x47): undefined reference to `glutBitmapHelvetica12' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(HsGLUT.o): In function `hs_GLUT_marshalStrokeFont': HsGLUT.c:(.text+0x52): undefined reference to `glutStrokeRoman' HsGLUT.c:(.text+0x6b): undefined reference to `glutStrokeMonoRoman' /home/donnie/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(HsGLUT.o): In function `hs_GLUT_getProcAddress': HsGLUT.c:(.text+0x85): undefined reference to `glutGetProcAddress' collect2: ld returned 1 exit status ### Build of Haskell OpenGL / GLUT "Hello World" program, linking fails ### ### ghc-pkg list ### ghc-pkg list /usr/lib/ghc-6.8.2/package.conf: Cabal-1.3.12, HTTP-3001.0.4, array-0.1.0.0, base-3.0.1.0, bytestring-0.9.0.1, containers-0.1.0.1, directory-1.0.0.0, filepath-1.1.0.0, {ghc-6.8.2}, haskell98-1.0.1.0, hpc-0.5.0.0, mtl-1.1.0.0, network-2.1.0.0, old-locale-1.0.0.0, old-time-1.0.0.0, packedstring-0.1.0.0, parsec-3.0.0, pretty-1.0.0.0, process-1.0.0.0, random-1.0.0.0, readline-1.0.1.0, rts-1.0, template-haskell-2.2.0.0, unix-2.3.0.0, zlib-0.4.0.4 /home/donnie/.ghc/i386-linux-6.8.2/package.conf: GLUT-2.1.1.2, OpenGL-2.2.1.1, bytestring-0.9.1.2, cgi-3001.1.5.2, cgi-3001.1.6.0, hpc-0.5.0.1, mtl-1.1.0.1, network-2.2.0.0, parsec-3.0.0, regex-base-0.93.1, regex-posix-0.93.1, regex-posix-0.93.2, xhtml-3000.1.0.0, xhtml-3000.2.0.0, xml-1.2.6, xml-1.3.1 ############# ### Cabal install of GLUT ### cabal install glut Resolving dependencies... Downloading OpenGL-2.2.1.1... Configuring OpenGL-2.2.1.1... checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for Windows environment... no checking how to run the C preprocessor... gcc -E checking for X... libraries , headers checking for gethostbyname... yes checking for connect... yes checking for remove... yes checking for shmat... yes checking for IceConnectionNumber in -lICE... yes checking build system type... i686-pc-linux-gnu checking host system type... i686-pc-linux-gnu checking target system type... i686-pc-linux-gnu checking for atan... no checking for atan in -lm... yes checking for GL library... -lGL -lm checking for GLU library... -lGLU -lGL -lm checking for grep that handles long lines and -e... /bin/grep checking for egrep... /bin/grep -E checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking GL/gl.h usability... yes checking GL/gl.h presence... yes checking for GL/gl.h... yes checking OpenGL/gl.h usability... no checking OpenGL/gl.h presence... no checking for OpenGL/gl.h... no checking GL/glu.h usability... yes checking GL/glu.h presence... yes checking for GL/glu.h... yes checking OpenGL/glu.h usability... no checking OpenGL/glu.h presence... no checking for OpenGL/glu.h... no checking Haskell type for GLboolean... Word8 checking Haskell type for GLbyte... Int8 checking Haskell type for GLubyte... Word8 checking Haskell type for GLshort... Int16 checking Haskell type for GLushort... Word16 checking Haskell type for GLint... Int32 checking Haskell type for GLuint... Word32 checking Haskell type for GLsizei... Int32 checking Haskell type for GLenum... Word32 checking Haskell type for GLbitfield... Word32 checking Haskell type for GLfloat... Float checking Haskell type for GLclampf... Float checking Haskell type for GLdouble... Double checking Haskell type for GLclampd... Double checking Haskell type for GLchar... Int8 checking Haskell type for GLintptr... Int32 checking Haskell type for GLsizeiptr... Int32 configure: creating ./config.status config.status: creating config.mk config.status: creating OpenGL.buildinfo config.status: creating include/HsOpenGLConfig.h config.status: creating include/HsOpenGL.h config.status: include/HsOpenGL.h is unchanged Preprocessing library OpenGL-2.2.1.1... Building OpenGL-2.2.1.1... [ 1 of 84] Compiling Graphics.Rendering.OpenGL.GL.PeekPoke ( Graphics/Rendering/OpenGL/GL/PeekPoke.hs, dist/build/Graphics/Rendering/OpenGL/GL/PeekPoke.o ) [ 2 of 84] Compiling Graphics.Rendering.OpenGL.GL.IOState ( Graphics/Rendering/OpenGL/GL/IOState.hs, dist/build/Graphics/Rendering/OpenGL/GL/IOState.o ) [ 3 of 84] Compiling Graphics.Rendering.OpenGL.GL.GLboolean ( Graphics/Rendering/OpenGL/GL/GLboolean.hs, dist/build/Graphics/Rendering/OpenGL/GL/GLboolean.o ) [ 4 of 84] Compiling Graphics.Rendering.OpenGL.GL.Extensions ( Graphics/Rendering/OpenGL/GL/Extensions.hs, dist/build/Graphics/Rendering/OpenGL/GL/Extensions.o ) [ 5 of 84] Compiling Graphics.Rendering.OpenGL.GL.Exception ( Graphics/Rendering/OpenGL/GL/Exception.hs, dist/build/Graphics/Rendering/OpenGL/GL/Exception.o ) [ 6 of 84] Compiling Graphics.Rendering.OpenGL.GL.StateVar ( Graphics/Rendering/OpenGL/GL/StateVar.hs, dist/build/Graphics/Rendering/OpenGL/GL/StateVar.o ) [ 7 of 84] Compiling Graphics.Rendering.OpenGL.GL.FlushFinish ( Graphics/Rendering/OpenGL/GL/FlushFinish.hs, dist/build/Graphics/Rendering/OpenGL/GL/FlushFinish.o ) [ 8 of 84] Compiling Graphics.Rendering.OpenGL.GL.BasicTypes ( Graphics/Rendering/OpenGL/GL/BasicTypes.hs, dist/build/Graphics/Rendering/OpenGL/GL/BasicTypes.o ) [ 9 of 84] Compiling Graphics.Rendering.OpenGL.GL.SavingState ( Graphics/Rendering/OpenGL/GL/SavingState.hs, dist/build/Graphics/Rendering/OpenGL/GL/SavingState.o ) [10 of 84] Compiling Graphics.Rendering.OpenGL.GL.StringQueries ( Graphics/Rendering/OpenGL/GL/StringQueries.hs, dist/build/Graphics/Rendering/OpenGL/GL/StringQueries.o ) [11 of 84] Compiling Graphics.Rendering.OpenGL.GLU.Initialization ( Graphics/Rendering/OpenGL/GLU/Initialization.hs, dist/build/Graphics/Rendering/OpenGL/GLU/Initialization.o ) [12 of 84] Compiling Graphics.Rendering.OpenGL.GL.BlendingFactor ( Graphics/Rendering/OpenGL/GL/BlendingFactor.hs, dist/build/Graphics/Rendering/OpenGL/GL/BlendingFactor.o ) [13 of 84] Compiling Graphics.Rendering.OpenGL.GL.BufferMode ( Graphics/Rendering/OpenGL/GL/BufferMode.hs, dist/build/Graphics/Rendering/OpenGL/GL/BufferMode.o ) [14 of 84] Compiling Graphics.Rendering.OpenGL.GL.ComparisonFunction ( Graphics/Rendering/OpenGL/GL/ComparisonFunction.hs, dist/build/Graphics/Rendering/OpenGL/GL/ComparisonFunction.o ) [15 of 84] Compiling Graphics.Rendering.OpenGL.GL.DataType ( Graphics/Rendering/OpenGL/GL/DataType.hs, dist/build/Graphics/Rendering/OpenGL/GL/DataType.o ) [16 of 84] Compiling Graphics.Rendering.OpenGL.GL.EdgeFlag ( Graphics/Rendering/OpenGL/GL/EdgeFlag.hs, dist/build/Graphics/Rendering/OpenGL/GL/EdgeFlag.o ) [17 of 84] Compiling Graphics.Rendering.OpenGL.GL.Face ( Graphics/Rendering/OpenGL/GL/Face.hs, dist/build/Graphics/Rendering/OpenGL/GL/Face.o ) [18 of 84] Compiling Graphics.Rendering.OpenGL.GL.PixelFormat ( Graphics/Rendering/OpenGL/GL/PixelFormat.hs, dist/build/Graphics/Rendering/OpenGL/GL/PixelFormat.o ) [19 of 84] Compiling 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Reading package info from "dist/installed-pkg-config" ... done. Saving old package config file... done. Writing new package config file... done. Downloading GLUT-2.1.1.2... Configuring GLUT-2.1.1.2... checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for Windows environment... no checking how to run the C preprocessor... gcc -E checking for X... libraries , headers checking for gethostbyname... yes checking for connect... yes checking for remove... yes checking for shmat... yes checking for IceConnectionNumber in -lICE... yes checking build system type... i686-pc-linux-gnu checking host system type... i686-pc-linux-gnu checking target system type... i686-pc-linux-gnu checking for atan... no checking for atan in -lm... yes checking for GL library... -lGL -lm checking for GLU library... -lGLU -lGL -lm checking for grep that handles long lines and -e... /bin/grep checking for egrep... /bin/grep -E checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking windows.h usability... no checking windows.h presence... no checking for windows.h... no checking GL/glut.h usability... yes checking GL/glut.h presence... yes checking for GL/glut.h... yes checking for GLUT library... no checking for GL/glut.h... (cached) yes checking GLUT/glut.h usability... yes checking GLUT/glut.h presence... yes checking for GLUT/glut.h... yes checking for windows.h... (cached) no configure: creating ./config.status config.status: creating config.mk config.status: creating GLUT.buildinfo config.status: creating include/HsGLUTConfig.h config.status: creating include/HsGLUT.h Preprocessing library GLUT-2.1.1.2... Building GLUT-2.1.1.2... 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Reading package info from "dist/installed-pkg-config" ... done. Saving old package config file... done. Writing new package config file... done. #################### ### Installed Debian packages ### dpkg -l | grep OpenGL ii freeglut3 2.4.0-5 OpenGL Utility Toolkit ii freeglut3-dev 2.4.0-5 OpenGL Utility Toolkit development files ii libgl1-mesa-dev 7.0.3-5 A free implementation of the OpenGL API -- G ii libgl1-mesa-dri 7.0.3-5 A free implementation of the OpenGL API -- D ii libgl1-mesa-glx 7.0.3-5 A free implementation of the OpenGL API -- G ii libglu1-mesa 7.0.3-5 The OpenGL utility library (GLU) ii libglu1-mesa-dev 7.0.3-5 The OpenGL utility library -- development fi ii libglw1-mesa 7.0.3-5 A free implementation of the OpenGL API -- r ii libglw1-mesa-dev 7.0.3-5 A free implementation of the OpenGL API -- d ######################

3 7

Random question
by Iain Barnett 07 Oct '08

07 Oct '08

Hi, I have a function, that produces a random number between two given numbers rand :: Int -> Int -> IO Int rand low high = getStdRandom (randomR (low,high)) (Naively) I'd like to write something like take (rand 1 10 ) [1..10] and see [1,2,3,4] ... or anything but nasty type-error messages. I'm reading about 6 tutorials on monads simultaneously but still can't crack this simple task, and won't pain you with all the permutations of code I've already tried. It's a lot, and it ain't pretty. Would anyone be able to break away from C/C++ vs Haskell to help? Just a point in the right direction or a good doc to read, anything that helps will be much appreciated. Regards Iain

11 17

Hmm, what license to use?
by Magnus Therning 06 Oct '08

06 Oct '08

Recently I received an email with a question regarding the licensing of a module I've written and uploaded to Hackage. I released it under LGPL. The sender wondered if I would consider re-licensing the code under BSD (or something similar) that would remove the need for users to provide linkable object files so that users can re-link programs against newer/modified versions of my library. Now I have fairly strong feelings about freedom of code and I everything I release is either under GPL or LGPL. What I like about those licenses is it protects freedom in a way that I think it should and it forces a sort of reciprocity which resonates very well with my selfishness. Re-licensing code under BSD is not something I'm willing to do without something that compensates for that reciprocity, and I can think of several kinds of compensation here but they all pretty much boil down to either fame or fortune. ;-) Once GHC supports dynamic binding on all platforms (or at least the major ones) this issue will (largely) go away (thanks Andrew for reporting on the state of this), but until then LGPL does create a large burden for users of my module. Until that happens I wouldn't mind re-licensing the code under a license that has the reciprocity attribute of LGPL on the source level, but does allow for static linking without requiring the availability of linkable object files. Is there such a license? I've heard that the OCaml crowd uses a modified LGPL with a static linking exception. Unfortunately I've also heard that their addition to LGPL hasn't gotten much review by lawyers, I'd much rather use something that feels less ad hoc, if you get what I mean. Any suggestions? /M -- Magnus Therning (OpenPGP: 0xAB4DFBA4) magnus＠therning．org Jabber: magnus＠therning．org http://therning.org/magnus identi.ca|twitter: magthe

37 96

Health effects
by Andrew Coppin 06 Oct '08

06 Oct '08

The other day, I sat down to eat a 2 Kg block of chocolate - one of those ones that's divided into lots of little squares. I proceeded to recursively subdivide it into smaller and smaller blocks, and then eat the individual squares in depth-first order. It was only after getting through 16 of the things that I stopped to notice that the whole bar just happens to have an exact power of two squares on it. And it was some time after *that* when I thought to myself "...woah, maybe do too much Haskell?" o_O Seriously, who recursively subdivides their food? I think I have something wrong with me...

23 40