Missing libraries to build snes9x-gtk

[benoitryder]

When attempting to build snes9x-gtk with default configuration (no option provided to configure) the build fails due to the following missing libraries: libX11, libdl, libXext.

Moreover, it is not possible to add them by setting LIBS when calling configure because the value is overriden by OpenGL libs (the simple patch below fixes this).

diff --git a/gtk/configure.ac b/gtk/configure.ac
index c03db53..77339b4 100644
--- a/gtk/configure.ac
+++ b/gtk/configure.ac
@@ -186,7 +186,7 @@ if test yes = "$with_opengl" ; then
     AC_CHECK_LIB(GL,glGetString,[
         OPENGL=yes
         CFLAGS="$CFLAGS -DUSE_OPENGL"
-        LIBS="-lGL"
+        LIBS="$LIBS -lGL"
     ],[
         OPENGL=0
     ])

[ghost]

pkg-config should be handling the inclusion of those libraries with gdk-x11, so I'm not sure why they're not being added. I've added a fixed inclusion of them just in case, and fixed the overwriting issue you mentioned.