[gtk+] build: Require libepoxy

[Matthias Clasen <matthiasc src gnome org>]

commit 892c6bd6f9644014fab0fe9c90b69f58258da232
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Jul 2 13:15:01 2014 +0100

    build: Require libepoxy
    
    If we want to use OpenGL in GDK then we have two choices; either:
    
      - find the GL headers on each platform
      - do extension discovery
      - implement all the crazy dlopen()/dlsym() dispatch tables
    
    *or* use libepoxy, which shields us from all this madness and provides a
    decent layer for GL clients to use, without creating its own namespace.
    
    Epoxy is also used by other projects, like Xorg and piglit, and it's
    portable to all the platforms GDK cares about.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=119189

 configure.ac |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 65de7fc..7927b39 100644
--- a/configure.ac
+++ b/configure.ac
@@ -48,6 +48,7 @@ m4_define([cairo_required_version], [1.12.0])
 m4_define([gdk_pixbuf_required_version], [2.30.0])
 m4_define([introspection_required_version], [1.39.0])
 m4_define([wayland_required_version], [1.5.91])
+m4_define([epoxy_required_version], [1.0])
 GLIB_REQUIRED_VERSION=glib_required_version
 PANGO_REQUIRED_VERSION=pango_required_version
 ATK_REQUIRED_VERSION=atk_required_version
@@ -1326,7 +1327,7 @@ CFLAGS="$saved_cflags"
 LDFLAGS="$saved_ldflags"
 
 GDK_PACKAGES="$PANGO_PACKAGES gdk-pixbuf-2.0 >= gdk_pixbuf_required_version cairo >= cairo_required_version 
cairo-gobject >= cairo_required_version"
-GDK_PRIVATE_PACKAGES="$GDK_GIO_PACKAGE $X_PACKAGES $WAYLAND_PACKAGES $cairo_backends"
+GDK_PRIVATE_PACKAGES="$GDK_GIO_PACKAGE $X_PACKAGES $WAYLAND_PACKAGES $cairo_backends epoxy >= 
epoxy_required_version"
 if test "x$enable_x11_backend" = xyes; then
   GDK_PRIVATE_PACKAGES="$GDK_PRIVATE_PACKAGES pangoft2"
 fi