Hi Kent,
Gqrx is probably not what you should try building on OS X if you have
no experience. It has many dependencies and can quickly become a
lengthy process, unless you have GNU Radio installed via e.g.
Macports. On the other hand, Elias Onal is building gqrx for Mac OS X
every now and then and I recommend you try his bundle, which also
includes various rtlsdr utilities:
http://dekar.wc3edit.net/2012/09/30/osx-port-of-the-awesome-gqrx-sdr-software/
Alex