Set byte order defines when compiled on OSX
Byte order defines have a DARWIN prefix on OSX so the values openbsc
expects are set from their Darwin counterparts when compiled on OSX.
diff --git a/openbsc/src/libtrau/rtp_proxy.c b/openbsc/src/libtrau/rtp_proxy.c
index 3d34ac6..f7c5a4f 100644
--- a/openbsc/src/libtrau/rtp_proxy.c
+++ b/openbsc/src/libtrau/rtp_proxy.c
@@ -42,7 +42,13 @@
#include <limits.h>
#ifndef __BYTE_ORDER
-#error "__BYTE_ORDER should be defined by someone"
+# ifdef __APPLE__
+# define __BYTE_ORDER __DARWIN_BYTE_ORDER
+# define __LITTLE_ENDIAN __DARWIN_LITTLE_ENDIAN
+# define __BIG_ENDIAN __DARWIN_BIG_ENDIAN
+# else
+# error "__BYTE_ORDER should be defined by someone"
+# endif
#endif
static LLIST_HEAD(rtp_sockets);