Fix test compilation with exa.h in configure when using glibc 2.20. Inspired by a patch by Peter Hutterer <peter.hutterer@who-t.net>. See <https://raw.githubusercontent.com/openembedded/oe-core/master/meta/recipes-graphics/xorg-driver/xf86-input-synaptics/always_include_xorg_server.h.patch>. --- xf86-video-mach64-6.9.4/configure.~1~ 2012-12-20 01:16:10.000000000 -0500 +++ xf86-video-mach64-6.9.4/configure 2014-12-19 02:48:18.040097554 -0500 @@ -18370,7 +18370,9 @@ SAVE_CPPFLAGS="$CPPFLAGS" CPPFLAGS="$CPPFLAGS $XORG_CFLAGS" - ac_fn_c_check_header_mongrel "$LINENO" "exa.h" "ac_cv_header_exa_h" "$ac_includes_default" + ac_fn_c_check_header_mongrel "$LINENO" "exa.h" "ac_cv_header_exa_h" "$ac_includes_default +#include <xorg-server.h> +" if test "x$ac_cv_header_exa_h" = xyes; then : have_exa_h="yes" else