Hi, It looks like both Thorkil and myself see very similar problems: Mine: scons: Reading SConscript files ... Building version 0.7.0-20070712053136-custom. Checking for architecture... x86 Checking for operating system... linux2 Checking for Subversion binary... "svn" Checking for Subversion version... Found version 1.4.4. Checking for GHC binary... "ghc" Checking for GHC version 6.4.1 or later... Found version 6.6.1. Checking for C header file gmp.h... yes Checking for mpz_t integ; mpz_init (integ) in C library gmp... yes Checking for libgmp version... 4.2.1 scons: *** File "/home2/dima/repos/yhc/build/configure.py", line 109, in configure See also: http://haskell.org/pipermail/yhc/2007-July/001011.html (full message, also has debug output from scons) Thorkil's (almost identical, even on completely different architecture): scons: Reading SConscript files ... Building version 0.7.0-20070712053136-custom. Checking for architecture... (cached) ppc Checking for operating system... (cached) darwin Checking for Subversion binary... (cached) "svn" Checking for Subversion version... (cached) Found version 1.4.0. Checking for GHC binary... (cached) "ghc" Checking for GHC version 6.4.1 or later... (cached) Found version 6.6.2. Checking for C header file gmp.h... yes Checking for mpz_t integ; mpz_init (integ) in C library gmp... yes Checking for libgmp version... 4.2.1 scons: *** File "/Users/thorkilnaur/tn/YhcDarcsRepository/yhc/build/configure.py", line 109, in configure I'm suspecting gmp as the test fails exactly there. Does anyone have an older gmp (3.x) to try? PS I have gmp 3.x on an older computer. For some reason, I couldn't build Yhc completely after darcs pull (I didn't fullclean, and I am basically migrating my development away from that computer), but at least scons testing of gmp did not fail. I cannot blame on the newer gmp otherwise, as ghc works fine with it. It seems something wrong with scons. Thorkil: when were you able to build Yhc last time, and what was your gmp version then? Thanks. -- Dimitry Golubovsky Anywhere on the Web