6.4 vs 6.2.2 can't compile darcs-1.0.2

Hello! Today I've tried to compile darcs-1.0.2 and for that I've installed the ghc-6.4-i386-unknown-linux.tar.bz2 (in-place) When I tried to compile, configure script from darcs complained that it couldn't figure out how to do OpenFd (or someting similar). Then I've installed ghc-6.2.2-i386-unknown-linux.tar.bz2 (also in-place). Now compilation was sucessfull. Are these 2 versions not compatible? -- Minds, like parachutes, function best when open