sync code with last improvements from OpenBSD

dist/libepoxy/test/headerguards.c

@@ -0,0 +1,60 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "config.h"
+
+#include <epoxy/gl.h>
+
+#ifdef BUILD_EGL
+#include <epoxy/egl.h>
+#include <epoxy/egl.h>
+#endif
+
+#ifdef BUILD_GLX
+#include <epoxy/glx.h>
+#include <epoxy/glx.h>
+#endif
+
+#ifdef BUILD_EGL
+#include <EGL/egl.h>
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <EGL/eglext.h>
+#endif
+
+#ifdef BUILD_GLX
+#ifdef __APPLE__
+#include <OpenGL/gl.h>
+#include <OpenGL/glext.h>
+#else
+#include <GL/gl.h>
+#include <GL/glext.h>
+#endif
+#include <GL/glx.h>
+#include <GL/glxext.h>
+#endif
+
+int main(int argc, char **argv)
+{
+    return 0;
+}