I found a similar problem, but got a little nugget of info in the error
on OS X 10.8 Mountain Lion:
make
compiling rr.cpp
make: g++-4.2: No such file or directory
make: *** [rr.o] Error 1
I found that all you need to do on Mountain Lion is:
1: Make sure you've installed Xcode command line tools so that the g++
directory is in /usr/bin
2: Type "sudo ln -s g++ g++-4.2"
Enjoy :)