I'm trying to build glibc 2.5 with a bootstrap i386 compiler on a x86_64 host. I have configured the build witht the following command line: CC=${TARGET}-gcc ../glibc-2.5/configure --target=$TARGET --prefix=$PREFIX --with-headers=${TARGET_PREFIX }/include --enable-add-ons=linuxthreads --without-tls --without-cvs --disable-sanity-checks where TARGET = i386-pc-linux-gnu and PREFIX = /usr/local/crossgcc When I do a 'make all' I get the following error: In file included from ../linuxthreads/sysdeps/x86_64/tls.h:25, from ../include/tls.h:6, from ../sysdeps/unix/sysv/linux/x86_64/sysdep.h:26, from <stdin>:1: ../linuxthreads/sysdeps/x86_64/pt-machine.h:27:24: error: asm/prctl.h: No such file or directory make[2]: *** [/home/dallas/crossbuild/build-glibc/glibc-build/tcb- offsets.h] Error 1 make[2]: Leaving directory `/home/dallas/crossbuild/build-glibc/glibc-2.5/csu' make[1]: *** [csu/subdir_lib] Error 2 make[1]: Leaving directory `/home/dallas/crossbuild/build-glibc/glibc-2.5 ' make: *** [all] Error 2 Does anyone know how to overcome this error?