Hello, When I say "scons" to a freshly pulled yhc, this is the response: 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 tried the scons fullclean + depends sequence also, the result is the same. Interestingly, my yhc buildbot slave seems in good shape ... Help would be very much appreciated. Thanks and regards Thorkil