Hello, I recently succeeded in making a cross-compiler for x86_64 FreeBSD with multilib support. Now I was just trying to make another for NetBSD and another for OpenBSD, but I encountered several problems: First: OpenBSD, I failed making binutils and this is the error: **** ld does not support target x86_64-pc-openbsd5.6 As much as I can understand linker doesn't support x86_64-pc-openbsd5.6 triplet, but why? I know that is possible compile gcc for openbsd system. However this is configuration with flags: ../gcc-4.9.2/configure --target="amd64-openbsd5.6" --prefix="/usr/local/cross" --with-gnu-as --with-gnu-ld --enable-languages=c,c++ --disable-nls --enable-libssp --enable-gold --enable-ld --with-sysroot="/usr/local/sysroot/openbsd5.6" $opt --disable-libgomp (I used the same prefix path of FreeBSD installation, it's ok?) Second: NetBSD binutils succeeded, but making gcc it fail with this log: libtool: compile: /home/nick/Documenti/Programmazione/cross/cross-gcc/build-gcc-x86_64-netbsd5.2.3/./gcc/xgcc -B/home/nick/Documenti/Programmazione/cross/cross-gcc/build-gcc-x86_64-netbsd5.2.3/./gcc/ -B/usr/local/cross/x86_64-netbsd5.2.3/bin/ -B/usr/local/cross/x86_64-netbsd5.2.3/lib/ -isystem /usr/local/cross/x86_64-netbsd5.2.3/include -isystem /usr/local/cross/x86_64-netbsd5.2.3/sys-include "-DPACKAGE_NAME=\"Cilk Runtime Library\"" -DPACKAGE_TARNAME=\"cilk-runtime-library\" -DPACKAGE_VERSION=\"2.0\" "-DPACKAGE_STRING=\"Cilk Runtime Library 2.0\"" -DPACKAGE_BUGREPORT=\"cilk@xxxxxxxxx\" -DPACKAGE_URL=\"\" -DPACKAGE=\"cilk-runtime-library\" -DVERSION=\"2.0\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_ALLOCA=1 -DHAVE_ATTRIBUTE_VISIBILITY=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -I. -I../../../gcc-4.9.2/libcilkrts -I../../../gcc-4.9.2/libcilkrts/include -I../../../gcc-4.9.2/libcilkrts/runtime -I../../../gcc-4.9.2/libcilkrts/runtime/config/x86 -DIN_CILK_RUNTIME=1 -fcilkplus -I../../../gcc-4.9.2/libcilkrts/include -I../../../gcc-4.9.2/libcilkrts/runtime -I../../../gcc-4.9.2/libcilkrts/runtime/config/x86 -DIN_CILK_RUNTIME=1 -fcilkplus -std=c99 -g -O2 -MT os-unix.lo -MD -MP -MF .deps/os-unix.Tpo -c ../../../gcc-4.9.2/libcilkrts/runtime/os-unix.c -fPIC -DPIC -o .libs/os-unix.o ../../../gcc-4.9.2/libcilkrts/runtime/os-unix.c:69:5: error: #error "Unsupported OS" # error "Unsupported OS" ^ ../../../gcc-4.9.2/libcilkrts/runtime/os-unix.c: In function '__cilkrts_hardware_cpu_count': ../../../gcc-4.9.2/libcilkrts/runtime/os-unix.c:386:2: error: #error "Unknown architecture" #error "Unknown architecture" ^ ../../../gcc-4.9.2/libcilkrts/runtime/os-unix.c: In function '__cilkrts_yield': ../../../gcc-4.9.2/libcilkrts/runtime/os-unix.c:419:5: warning: implicit declaration of function 'pthread_yield' [-Wimplicit-function-declaration] pthread_yield(); ^ Makefile:691: set di istruzioni per l'obiettivo "os-unix.lo" non riuscito make[2]: *** [os-unix.lo] Errore 1 make[2]: uscita dalla directory "/home/nick/Documenti/Programmazione/cross/cross-gcc/build-gcc-x86_64-netbsd5.2.3/x86_64-netbsd5.2.3/libcilkrts" Makefile:10295: set di istruzioni per l'obiettivo "all-target-libcilkrts" non riuscito make[1]: *** [all-target-libcilkrts] Errore 2 make[1]: uscita dalla directory "/home/nick/Documenti/Programmazione/cross/cross-gcc/build-gcc-x86_64-netbsd5.2.3" Makefile:859: set di istruzioni per l'obiettivo "all" non riuscito make: *** [all] Errore 2 what can be the cause? Thank you for your help, Niccolò F.