Hi, I forgot one thing: at the solaris x86 system is a ghc-6.2 already installed. Via start script it uses -fvia-C. So building 6.4.2 with it give me a different error: # PATH=/var/tmp/gsauthof/bin:/usr/sfw/bin:$PATH ./configure --with-gcc=/usr/sfw/bin/gcc --with-ghc="/vol/ghc-6.2/bin/ghc" --prefix=/var/tmp/gsauthof/ghc-6.4.2 2>&1 | tee log mk/config.mk GhcWithInterpreter=YES => NO apply the three patches from last mail #PATH=/var/tmp/gsauthof/bin:/usr/sfw/bin:$PATH make 2>&1 | tee log2 /vol/ghc-6.2/bin/ghc -H16m -O -I. -Iinclude -Rghc-timing -I../../../libraries - fglasgow-exts -no-recomp -c System/Directory/Internals.hs -o System/Directory /Internals.o -ohi System/Directory/Internals.hi Prologue junk?: .globl __stginit_SystemziDirectoryziInternals .type __stginit_SystemziDirectoryziInternals, @function __stginit_SystemziDirectoryziInternals: pushl %ebp movl %esp, %ebp <<ghc: 37676952 bytes, 8 GCs, 1687962/3336696 avg/max bytes residency (2 samples ), 19M in use, 0.00 INIT (0.00 elapsed), 0.13 MUT (0.54 elapsed), 0.03 GC (0.05 elapsed) :ghc>> make[4]: *** [System/Directory/Internals.o] Error 255 Does anyone have an idea about this? Regards Georg Sauthoff