Use of Mex in Matlab for Mac

I am having troubles using a .c function with mex on Matlab for Mac (iOS 10.9.5) with XCode 6.0 (supported). When i try compiling using the command

mex components_mex.c

i get the following error

Error using mex
Undefined symbols for architecture x86_64:
  "_strong_components", referenced from:
      _mexFunction in components_mex.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

I have joined the functions and necessary files to help.

Thanks in advance, I am really desperate even for just a tip. Nassim