Command used to build gcc: ../gcc/configure --enable-languages=c,c++ --prefix=/opt/gcc-latest; make I get the following error: make[4]: Leaving directory `/home/dhruvbird/projects/gcc-build/i686-pc-linux-gnu/libgcc' DEFINES='' HEADERS='../../../gcc/libgcc/config/i386/value-unwind.h' \ ../../../gcc/libgcc/mkheader.sh > tmp-libgcc_tm.h /bin/bash ../../../gcc/libgcc/../move-if-change tmp-libgcc_tm.h libgcc_tm.h echo timestamp > libgcc_tm.stamp /home/dhruvbird/projects/gcc-build/./gcc/xgcc -B/home/dhruvbird/projects/gcc-build/./gcc/ -B/opt/gcc-latest/i686-pc-linux-gnu/bin/ -B/opt/gcc-latest/i686-pc-linux-gnu/lib/ -isystem /opt/gcc-latest/i686-pc-linux-gnu/include -isystem /opt/gcc-latest/i686-pc-linux-gnu/sys-include -g -O2 -O2 -g -O2 -DIN_GCC -W -Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition -isystem ./include -fpic -g -DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector -fpic -I. -I. -I../.././gcc -I../../../gcc/libgcc -I../../../gcc/libgcc/. -I../../../gcc/libgcc/../gcc -I../../../gcc/libgcc/../include -I../../../gcc/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS -DUSE_TLS -o _muldi3.o -MT _muldi3.o -MD -MP -MF _muldi3.dep -DL_muldi3 -c ../../../gcc/libgcc/libgcc2.c -fvisibility=hidden -DHIDE_EXPORTS In file included from /usr/include/stdio.h:28:0, from ../../../gcc/libgcc/../gcc/tsystem.h:88, from ../../../gcc/libgcc/libgcc2.c:29: /usr/include/features.h:324:26: fatal error: bits/predefs.h: No such file or directory #include <bits/predefs.h> ^ compilation terminated. make[3]: *** [_muldi3.o] Error 1 make[3]: Leaving directory `/home/dhruvbird/projects/gcc-build/i686-pc-linux-gnu/libgcc' make[2]: *** [all-stage1-target-libgcc] Error 2 make[2]: Leaving directory `/home/dhruvbird/projects/gcc-build' make[1]: *** [stage1-bubble] Error 2 make[1]: Leaving directory `/home/dhruvbird/projects/gcc-build' make: *** [all] Error 2 Any idea how I can fix this? -- -Dhruv Matani. http://dhruvbird.com/ "What's the simplest thing that could possibly work?" -- Ward Cunningham