The following patch was required for murmur to build on BSD. I'm having some runtime issues (daemon quits without error during start up), but I hope this will help others:

--- mumble-1.1.1/src/murmur/murmur_pch.h 2007-12-02 02:43:28.000000000 -0800
+++ mumble-1.1.1-bsdfix/src/murmur/murmur_pch.h 2007-12-09 02:49:14.000000000 -0800
@@ -26,6 +26,7 @@
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
+#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <errno.h>