When trying to compile the examples in gtk+hs, I get the following link errors: /opt/ghc/lib/ghc-5.02/libHSstd.a(PrelFloat__413.o): In function `shP2_2_alt': PrelFloat__413.o(.text+0x2b0): undefined reference to `__gmpz_cmp_si' etc.. When linking simple programs, this doesn't occur. I have the following gmp's installing: /usr/lib/libgmp.so.2.0.2 /usr/local/lib/libgmp.so.3.1.1 /opt/ghc/lib/ghc-5.02/libgmp.a It seems that the programs only link with the version in /usr/local/lib. I tried putting this path in 'library_dirs' for package 'gmp' in 'package.conf', but to no avail. Only when I explicitly put '/usr/local/lib/libgmp.so' in 'extra_ld_opts' for package 'gmp' did it work.

The version in /opt/ghc/lib/ghc-5.02 should work, as should /usr/local/lib/libgmp.so.3.1.1. The version in /usr/lib looks like GMP 2, so that would cause the link errors. Make sure the link command line doesn't have -L/usr/lib on it, or at least not before -L/usr/local/lib and -L/opt/ghc/lib/ghc-5.02. Cheers, Simon