two small things (working on FreeBSD12-RELEASE with clang 6.0.1)

[sawdustdood]

Won't compile with straight clone. The Makefile.in appears to need to be updated with:
$(CC) rather than an explicit call to gcc
and need to add:
#include <netinet/in.h>
to utility.h because sockaddr_in is in a different location in FreeBSD.
I'm super-noob, so I'm not sure the best way to do the latter, but I would imagine this would be in the configure.

[ColumPaget]

Thanks for this! These changes are in the latest release, which now builds under macosx too! (probably also other BSDs).