What is this Xcode build error trying to tell me?

Is the following build error easy to diagnose? But I'm unsure if something of this nature fits on the website.

Undefined symbols for architecture x86_64:
  "myMain(int, char**)", referenced from:
      _main in p3support.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Undefined symbol: myMain(int, char**)