build: Don't fail if libX11 isn't installed

configure.ac would previously refuse to complete if libX11 wasn't
installed, even if we'd disabled GLX and weren't building an X11 EGL
platform.  Make the check simply set the no_x variable that's used (but
never set) immediately below for what looks like this very case.

Signed-off-by: Daniel Stone <daniel@fooishbar.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Dan Nicholson <dbn.lists@gmail.com>

diff --git a/configure.ac b/configure.ac
index 6c7a1929eb5022792f8271742f6b252ff6da1134..aa72523c0a53002b865d3f21ab78f9156b09c2c3 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -810,7 +810,7 @@ if test "x$enable_dri" = xyes; then
 fi
 
 dnl Find out if X is available.
-PKG_CHECK_MODULES([X11], [x11])
+PKG_CHECK_MODULES([X11], [x11], [no_x=no], [no_x=yes])
 
 dnl Try to tell the user that the --x-* options are only used when
 dnl pkg-config is not available. This must be right after AC_PATH_XTRA.