# From https://github.com/snakeyroc3/homebrew/commit/8cde20b7a8de828e5e094366629f12ae83aa96ea

--- a/src/fcarch.h  2012-07-23 19:01:32.000000000 -0700
+++ b/src/fcarch.h  2012-10-20 10:29:15.000000000 -0700
@@ -46,6 +46,19 @@
  * be64    1234    8    8
  */

+#ifdef __APPLE__
+# include <machine/endian.h>
+# undef SIZEOF_VOID_P
+# undef ALIGNOF_DOUBLE
+# ifdef __LP64__
+#  define SIZEOF_VOID_P 8
+#  define ALIGNOF_DOUBLE 8
+# else
+#  define SIZEOF_VOID_P 4
+#  define ALIGNOF_DOUBLE 4
+# endif
+#endif
+
 #if defined(__DARWIN_BYTE_ORDER) && __DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN
 # define FC_ARCH_ENDIAN "le"
 #elif defined(__DARWIN_BYTE_ORDER) && __DARWIN_BYTE_ORDER == __DARWIN_BIG_ENDIAN