How to run MOOG on OS X Yosemite
In order to execute the compiled binaries, all libraries on which the executable depends must be in the correct location. In particular, the error specified in the question is due to the fact that my .moog folder was in ~/, my user home folder, rather than /, the root of my hard drive, as explained here. 

To solve the problem:

cd

mv .moog /.moog

See this link for answer on how to get MOOG to find SM libraries for plotting.