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diff --git a/ax/ax_check_gl.m4 b/ax/ax_check_gl.m4
new file mode 100644
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+dnl @synopsis AX_CHECK_GL
+dnl
+dnl Check for an OpenGL implementation. If GL is found, the required
+dnl compiler and linker flags are included in the output variables
+dnl "GL_CFLAGS" and "GL_LIBS", respectively. This macro adds the
+dnl configure option "--with-apple-opengl-framework", which users can
+dnl use to indicate that Apple's OpenGL framework should be used on Mac
+dnl OS X. If Apple's OpenGL framework is used, the symbol
+dnl "HAVE_APPLE_OPENGL_FRAMEWORK" is defined. If no GL implementation
+dnl is found, "no_gl" is set to "yes".
+dnl
+dnl @category InstalledPackages
+dnl @author Braden McDaniel <braden@endoframe.com>
+dnl @version 2004-11-15
+dnl @license AllPermissive
+
+AC_DEFUN([AX_CHECK_GL],
+[AC_REQUIRE([AC_PATH_X])dnl
+AC_REQUIRE([ACX_PTHREAD])dnl
+
+#
+# There isn't a reliable way to know we should use the Apple OpenGL framework
+# without a configure option.  A Mac OS X user may have installed an
+# alternative GL implementation (e.g., Mesa), which may or may not depend on X.
+#
+AC_ARG_WITH([apple-opengl-framework],
+            [AC_HELP_STRING([--with-apple-opengl-framework],
+                            [use Apple OpenGL framework (Mac OS X only)])])
+if test "X$with_apple_opengl_framework" = "Xyes"; then
+  AC_DEFINE([HAVE_APPLE_OPENGL_FRAMEWORK], [1],
+            [Use the Apple OpenGL framework.])
+  GL_LIBS="-framework OpenGL"
+else
+  AC_LANG_PUSH(C)
+
+  AX_LANG_COMPILER_MS
+  if test X$ax_compiler_ms = Xno; then
+    GL_CFLAGS="${PTHREAD_CFLAGS}"
+    GL_LIBS="${PTHREAD_LIBS} -lm"
+  fi
+
+  #
+  # Use x_includes and x_libraries if they have been set (presumably by
+  # AC_PATH_X).
+  #
+  if test "X$no_x" != "Xyes"; then
+    if test -n "$x_includes"; then
+      GL_CFLAGS="-I${x_includes} ${GL_CFLAGS}"
+    fi
+    if test -n "$x_libraries"; then
+      GL_LIBS="-L${x_libraries} -lX11 ${GL_LIBS}"
+    fi
+  fi
+
+  AC_CHECK_HEADERS([windows.h])
+
+  AC_CACHE_CHECK([for OpenGL library], [ax_cv_check_gl_libgl],
+  [ax_cv_check_gl_libgl="no"
+  ax_save_CPPFLAGS="${CPPFLAGS}"
+  CPPFLAGS="${GL_CFLAGS} ${CPPFLAGS}"
+  ax_save_LIBS="${LIBS}"
+  LIBS=""
+  ax_check_libs="-lopengl32 -lGL"
+  for ax_lib in ${ax_check_libs}; do
+    if test X$ax_compiler_ms = Xyes; then
+      ax_try_lib=`echo $ax_lib | sed -e 's/^-l//' -e 's/$/.lib/'`
+    else
+      ax_try_lib="${ax_lib}"
+    fi
+    LIBS="${ax_try_lib} ${GL_LIBS} ${ax_save_LIBS}"
+    AC_LINK_IFELSE(
+    [AC_LANG_PROGRAM([[
+# if HAVE_WINDOWS_H && defined(_WIN32)
+#   include <windows.h>
+# endif
+# include <GL/gl.h>]],
+                     [[glBegin(0)]])],
+    [ax_cv_check_gl_libgl="${ax_try_lib}"; break])
+  done
+  LIBS=${ax_save_LIBS}
+  CPPFLAGS=${ax_save_CPPFLAGS}])
+
+  if test "X${ax_cv_check_gl_libgl}" = "Xno"; then
+    no_gl="yes"
+    GL_CFLAGS=""
+    GL_LIBS=""
+  else
+    GL_LIBS="${ax_cv_check_gl_libgl} ${GL_LIBS}"
+  fi
+  AC_LANG_POP(C)
+fi
+
+AC_SUBST([GL_CFLAGS])
+AC_SUBST([GL_LIBS])
+])dnl