Use -D_DEFAULT_SOURCE to shut gcc up about usleep().
Use -D_DEFAULT_SOURCE to shut gcc up about usleep().

http://stackoverflow.com/a/10053817/2002146
I tried using -D_BSD_SOURCE as pointed out above... but then gcc
complained, so I used -D_DEFAULT_SOURCE. I have no idea what it does,
but it works!

ryanmjacobs/tl