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diff --git a/ax/ax_check_glu.m4 b/ax/ax_check_glu.m4
new file mode 100644
index 0000000..29d30bd
--- a/dev/null
+++ b/ax/ax_check_glu.m4
@@ -0,0 +1,71 @@
+dnl @synopsis AX_CHECK_GLU
+dnl
+dnl Check for GLU. If GLU is found, the required preprocessor and
+dnl linker flags are included in the output variables "GLU_CFLAGS" and
+dnl "GLU_LIBS", respectively. This macro adds the configure option
+dnl "--with-apple-opengl-framework", which users can use to indicate
+dnl that Apple's OpenGL framework should be used on Mac OS X. If
+dnl Apple's OpenGL framework is used, the symbol
+dnl "HAVE_APPLE_OPENGL_FRAMEWORK" is defined. If no GLU implementation
+dnl is found, "no_glu" 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_GLU],
+[AC_REQUIRE([AX_CHECK_GL])dnl
+AC_REQUIRE([AC_PROG_CXX])dnl
+GLU_CFLAGS="${GL_CFLAGS}"
+if test "X${with_apple_opengl_framework}" != "Xyes"; then
+  AC_CACHE_CHECK([for OpenGL Utility library], [ax_cv_check_glu_libglu],
+  [ax_cv_check_glu_libglu="no"
+  ax_save_CPPFLAGS="${CPPFLAGS}"
+  CPPFLAGS="${GL_CFLAGS} ${CPPFLAGS}"
+  ax_save_LIBS="${LIBS}"
+  LIBS=""
+  ax_check_libs="-lglu32 -lGLU"
+  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} ${ax_save_LIBS}"
+    #
+    # libGLU typically links with libstdc++ on POSIX platforms. However,
+    # setting the language to C++ means that test program source is named
+    # "conftest.cc"; and Microsoft cl doesn't know what to do with such a
+    # file.
+    #
+    AC_LANG_PUSH([C++])
+    if test X$ax_compiler_ms = Xyes; then
+      AC_LANG_PUSH([C])
+    fi
+    AC_LINK_IFELSE(
+    [AC_LANG_PROGRAM([[
+# if HAVE_WINDOWS_H && defined(_WIN32)
+#   include <windows.h>
+# endif
+# include <GL/glu.h>]],
+                     [[gluBeginCurve(0)]])],
+    [ax_cv_check_glu_libglu="${ax_try_lib}"; break])
+    if test X$ax_compiler_ms = Xyes; then
+      AC_LANG_POP([C])
+    fi
+    AC_LANG_POP([C++])
+  done
+  LIBS=${ax_save_LIBS}
+  CPPFLAGS=${ax_save_CPPFLAGS}])
+  if test "X${ax_cv_check_glu_libglu}" = "Xno"; then
+    no_glu="yes"
+    GLU_CFLAGS=""
+    GLU_LIBS=""
+  else
+    GLU_LIBS="${ax_cv_check_glu_libglu} ${GL_LIBS}"
+  fi
+fi
+AC_SUBST([GLU_CFLAGS])
+AC_SUBST([GLU_LIBS])
+])