[PATCH xserver] config: conftest needs an include directive to locate X11/Xfuncproto.h

[Gaetan Nadon]

The compiler option -fvisibility=hidden is erroneously missing
due to a faulty configuration test. The gcc command is unable to
locate X11/Xfuncproto.h unless the build occurs on a
system where X11 development headers are installed.

configure:21294: checking for symbol visibility support
configure:21323: gcc -std=gnu99 -c -g -O2 -fvisibility=hidden  conftest.c >&5
conftest.c:144:28: fatal error: X11/Xfuncproto.h: No such file or directory

The solution is to add an include directive to obtain the location
of X11/Xfuncproto.h which may or may not be the system installed headers.

Signed-off-by: Gaetan Nadon <memsize at videotron.ca>
---
 configure.ac |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/configure.ac b/configure.ac
index e4fcba4..3d5414f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1558,7 +1558,8 @@ if test "x$XORG" = xyes; then
 	    fi
 	    if test x$have_visibility != xno; then
 		save_CFLAGS="$CFLAGS"
-		CFLAGS="$CFLAGS $VISIBILITY_CFLAGS"
+		proto_inc=`$PKG_CONFIG --cflags xproto`
+		CFLAGS="$CFLAGS $VISIBILITY_CFLAGS $proto_inc"
 		AC_TRY_COMPILE(
 		    [#include <X11/Xfuncproto.h>
 		     extern _X_HIDDEN int hidden_int;
-- 
1.7.4.1