Hi, I have been trying to build a Cabal package that uses c2hs under mingw and have run into some problems. 1) c2hs needed its own options because it has to pass a flag to its invocation of the CPP. I have already submitted this patch. (I also noticed a request for cppOptions in the Cabal.cabal file, so I added that) 2) When c2hs generates the foreign import ccall unsafe "path/to/include.h function" :: Type it doesn't insert the appropriate number of path separators for windows ( i.e. \\ not \) I have this patch sitting in my copy of c2hs. But what I did is really ugly: at around line 567 (process :: FilePath -> FilePath -> CST s ()) I inserted: > outFName' <- getSwitch outputSB > -- on windows the path separator needs to be "\\" not "\" > let outFName = replaceFileSeparator outFName' where replaceFileSeparator is defined as: > replaceFileSeparator :: String -> String > replaceFileSeparator [] = [] > replaceFileSeparator (x:xs) > | x == '\\' = "\\\\" ++ (replaceFileSeparator xs) > | otherwise = x : (replaceFileSeparator xs) this fixes the problem but stinks. 3) when compiling my c2hs generated .hs file, the c2hs generated .h file is not being found. $ ./Setup.lhs -v build Reading parameters from D:\Apps\MSYS\1.0\local\src\mingw-c2hs-cabal-test\cabal-root\mingw- c2hs-cabal-test.buildinfo Preprocessing library Mingw-c2hs-cabal-test-0.0.1... D:\Apps\MSYS\1.0\local\bin\c2hs.exe -C -D__GLASGOW_HASKELL__=606 -C -I..\include --cppopts=-I../include --include=src -o src\Cabal\MingwTest.hs src\Cabal\MingwTest.chs D:\Apps\MSYS\1.0\local\bin\c2hs.exe -C -D__GLASGOW_HASKELL__=606 -C -I..\include --cppopts=-I../include --include=src -o src\Cabal\MingwTest2.hs src\Cabal\MingwTest2.chs Building Mingw-c2hs-cabal-test-0.0.1... d:\Apps\ghc\ghc- 6.6\bin\ghc.exe -package-name Mingw-c2hs-cabal-test-0.0.1--make -hide-all-packages -i -idist\build\autogen -i. -isrc -I..\include -#include "test.h" -odir dist\build -hidir dist\build -package base-2.0 -O -package haskell98 -fglasgow-exts -fffi Cabal.MingwTest Cabal.MingwTest2C2HS [1 of 3] Compiling C2HS ( src/C2HS.hs, dist\build/C2HS.o ) [2 of 3] Compiling Cabal.MingwTest ( src/Cabal/MingwTest.hs, dist\build/Cabal/MingwTest.o ) C:\DOCUME~1\vivian\LOCALS~1\Temp\ghc31772_0\ghc31772_0.hc:6:33: src\Cabal\MingwTest.h: No such file or directory I have attached a set of files that will generate the errors I have mentioned on mingw. Cheers, Vivian