Hi all, I'm something of a Haskell newbie, and this is my first post to this list. I'm trying to do some very basic things with graphs, but can't get started with Data.Graph. In particular, linking fails - I'm wondering if something's wrong with my install. (For the record: ghc-6.4 compiled/installed fresh today on gentoo linux - it _looks_ OK to my Haskell-untrained eyes). Here follows a small example which I believe should compile just fine: ---- Code begins "Main.hs" module Main where import Data.Graph.Inductive import System.IO main :: IO () main = putStrLn "Hello, world!" ---- Code ends As you can see, this basically does nothing! Unfortunately, here's what happens: [csandy@cspcag spa_haskell] ghc -o Main Main.hs Main.o(.text+0x145): In function `__stginit_Main_': : undefined reference to `__stginit_DataziGraphziInductive_' collect2: ld returned 1 exit status I get similar errors whatever I try to do with Data.Graph. Trying to compile ghc-6.4/libraries/fgl/test/test.hs (from the source tree) gives me multiple errors of the above type (though not identical). If anyone can shed any light on this, or tell me what stupid thing I'm doing wrong, I'd really appreciate it. Many thanks, -Andy -- Andy Gimblett Computer Science Department University of Wales Swansea http://www.cs.swan.ac.uk/~csandy/