eglplatform.h defaults to X11 on Unix unless told otherwise, so if we're doing a
build without any X11 support tell it so that we don't try including headers
that don't exist.

Also set GL_PC_FLAGS so that the definition is in egl.pl, so that applications
using EGL don't try to pull in X11 headers on systems where EGL was configured
without X11 support.

Signed-off-by: Ross Burton <ross.bur...@intel.com>

https://bugs.freedesktop.org/show_bug.cgi?id=64959
---
 configure.ac |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/configure.ac b/configure.ac
index 6832b0d..3a0cd77 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1490,6 +1490,13 @@ AC_SUBST([EGL_NATIVE_PLATFORM])
 AC_SUBST([EGL_PLATFORMS])
 AC_SUBST([EGL_CFLAGS])
 
+# If we don't have the X11 platform, set this define so we don't try to include
+# the X11 headers.
+if ! echo "$egl_platforms" | grep -q 'x11'; then
+    DEFINES="$DEFINES -DMESA_EGL_NO_X11_HEADERS"
+    GL_PC_CFLAGS="$GL_PC_CFLAGS -DMESA_EGL_NO_X11_HEADERS"
+fi
+
 AC_ARG_WITH([egl-driver-dir],
     [AS_HELP_STRING([--with-egl-driver-dir=DIR],
                     [directory for EGL drivers [[default=${libdir}/egl]]])],
-- 
1.7.10.4

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