Directory structure: $HOME/haiku/source --- git pulled Haiku source tree $HOME/haiku/buildtools --- git pulled Linux tools $HOME/haiku/HP-laptop --- one of several out-of-tree build hierarchies $ cd $HOME/haiku/HP-laptop $ ../source/configure --build-cross-tools x86 ../buildtools --use-gcc-pipe --use-gcc-graphite (fails) $ head -4 cross-tools-x86-build/isl/include/isl/stdint.h #ifndef _ISL_INCLUDE_ISL_STDINT_H #ifndef _GENERATED_STDINT_H INT_H 1 #define _GENERATED_STDINT_H "isl 0.12.2" Any ideas what's causing that line 3 to come out like that ? Without --use-gcc-graphite, the configure fails with checking for gmp.h... no configure: error: gmp.h can't be found, or is unusable even though $ find /usr/include .. -name gmp.h /usr/include/gmp.h ../HP-laptop/cross-tools-x86-build/gcc/gmp/gmp.h ../source/src/system/libroot/posix/glibc/stdlib/gmp.h ../source/src/system/libroot/posix/glibc/include/gmp.h Michael.