Where are the pkg-config files?

This article says that you can use pkg-config with MKL: https://software.intel.com/en-us/articles/intel-math-kernel-library-inte...

But I don't see the pkg-config files installed anywhere (OS X MKL 18 Update 1).

The article also includes the instruction "1. Go to the <mkl_install_dir>/mkl/bin/pkgconfig directory​"  

But there's no no such folder

ls /opt/intel/mkl/bin

only shows

mklvars.csh mklvars.sh