From http://www.jwz.org/xscreensaver/xscreensaver-5.27.tar.gz

[xscreensaver] / utils / aligned_malloc.h

diff --git a/utils/aligned_malloc.h b/utils/aligned_malloc.h
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+/* -*- mode: c; tab-width: 4; fill-column: 128 -*- */
+/* vi: set ts=4 tw=128: */
+
+/*
+aligned_malloc.h, Copyright (c) 2014 Dave Odell <dmo2118@gmail.com>
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.  No representations are made about the suitability of this
+software for any purpose.  It is provided "as is" without express or
+implied warranty.
+*/
+
+#ifndef __ALIGNED_MALLOC_H__
+#define __ALIGNED_MALLOC_H__
+
+#include <stdlib.h>
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#if _POSIX_VERSION >= 200112L || _XOPEN_VERSION >= 600
+
+# define aligned_malloc posix_memalign
+# define aligned_free   free
+
+#else /* old POSIX */
+
+ /* This can't simply be named posix_memalign, since the real thing uses
+    free(), but this one can't. */
+ int aligned_malloc(void **ptr, unsigned alignment, size_t size);
+ void aligned_free(void *);
+
+#endif /* old POSIX */
+
+#endif /* __ALIGNED_MALLOC_H__ */