remove --enable-gl

configure.ac

@@ -100,8 +100,6 @@ X11_EXT_VIDMODE
 X11_EXT_SHAPE
 X11_EXT_XINERAMA
 
-GL_OPTION
-
 AC_CONFIG_FILES([Makefile
                  po/Makefile.in
                  themes/Makefile

m4/gl.m4

@@ -1,65 +0,0 @@
-# X11_DEVEL()
-#
-# Check for the presence of the X Window System headers and libraries.
-# Sets the CPPFLAGS and LIBS variables as appropriate.
-AC_DEFUN([GL_OPTION],
-[
-  AC_REQUIRE([X11_DEVEL])
-
-  AC_ARG_ENABLE(gl, [  --enable-gl             enable support for OpenGL rendering default=no],
-                ,[enable_gl="no"])
-
-  # Store these
-  OLDLIBS=$LIBS
-  OLDCPPFLAGS=$CPPFLAGS
-
-  if test "$enable_gl" = "yes"; then
-    AC_CHECK_LIB([GL], [glXGetConfig],
-                 ,
-                 [
-                   enable_gl="no"
-                   AC_MSG_WARN([Disabling GL rendering support])
-                 ])
-  fi
-
-  if test "$enable_gl" = "yes"; then
-    CPPFLAGS="$CPPFLAGS $X_CFLAGS"
-    LIBS="$LIBS $X_PRE_LIBS $X_LIBS $X_EXTRA_LIBS"
-
-    AC_MSG_CHECKING([if we can compile with GL])
-    AC_TRY_LINK(
-    [
-      #include <GL/gl.h>
-    ],
-    [
-      GLfloat f = 0.0;
-      glVertex3f(f, f, f);
-    ],
-    [
-      AC_MSG_RESULT([yes])
-    ],
-    [
-      AC_MSG_RESULT([no])
-      AC_MSG_WARN([Disabling GL rendering support])
-      enable_gl="no"
-    ])
-
-    GL_CFLAGS=""
-    GL_LIBS="-lGL"
-    AC_SUBST(GL_CFLAGS)
-    AC_SUBST(GL_LIBS)
-  fi
-
-  CPPFLAGS=$OLDCPPFLAGS
-  LIBS=$OLDLIBS
-
-  AC_MSG_CHECKING([if GL support is enabled])
-  if test "$enable_gl" = "yes"; then
-    AC_MSG_RESULT([yes])
-
-    AC_DEFINE(USE_GL)
-  else
-    AC_MSG_RESULT([no])
-  fi
-  AM_CONDITIONAL([USE_GL], [test "$enable_gl" = "yes"])
-])