http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57792
--- Comment #5 from Jack Howarth <howarth at nitro dot med.uc.edu> --- I am really surprised the following change if insufficient to replace manually passing… --with-sysroot="`xcrun --show-sdk-path`" to configure on the command line for darwin13... Index: configure.ac =================================================================== --- configure.ac (revision 200683) +++ configure.ac (working copy) @@ -2848,6 +2848,13 @@ if test x${is_cross_compiler} = xyes ; t target_configargs="--with-cross-host=${host_noncanonical} ${target_configargs}" fi +case "${target}" in + x86_64-*-darwin13*) + target_configargs="--with-sysroot=\"`xcrun --show-sdk-path`\" ${target_configargs}" + ;; +esac + + # Default to --enable-multilib. if test x${enable_multilib} = x ; then target_configargs="--enable-multilib ${target_configargs}" Index: configure =================================================================== --- configure (revision 200683) +++ configure (working copy) @@ -7414,6 +7414,13 @@ if test x${is_cross_compiler} = xyes ; t target_configargs="--with-cross-host=${host_noncanonical} ${target_configargs}" fi +case "${target}" in + x86_64-*-darwin13*) + target_configargs="--with-sysroot=\"`xcrun --show-sdk-path`\" ${target_configargs}" + ;; +esac + + # Default to --enable-multilib. if test x${enable_multilib} = x ; then target_configargs="--enable-multilib ${target_configargs}" This patch (without explicitly passing --with-sysroot to configure) results in the fixincludes complaining about not finding /usr/include again but the top-level config.log shows target_configargs has --with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX10.9.sdk on it. Should I be appending "--with-sysroot=\"`xcrun --show-sdk-path`\" to different variable instead?