My message before the last one is waiting for approval of a moderator (the configure log file made it huge), hence the confusion. I tried to force fptools to produce dlls by putting a DLLized = YES in build.mk I get: ------------------------------------------------------------------------ ==fptools== make all - --unix -wr; in /cygdrive/c/fptools2/ghc/rts ------------------------------------------------------------------------ make[2]: *** No rule to make target `Main.dll_o', needed by `all'. Stop. make[1]: *** [all] Error 1 make[1]: Leaving directory `/cygdrive/c/fptools2/ghc' make: *** [build] Error 1 Main.dll_o being the file that ld couldn't find when I tried to compile Alpha.hs with the -dynamic option I feel quite lost and don't even know if I'm investigating in the right direction. Should I try and build only the HOpenGL library using the last stable GHC for windows and then somehow plug the package into it ? Yann