MacPorts + Slatec Library for Fortran

I have just installed the Slatec Common Mathematical Library for fortran using Macports. The installation was smooth with no errors. However, when writing a simple example code that calls the QAG integration routine from the library I get the following error:

slamch is begin referred from r1mach - which is a routine that deals with machine constants I think.

This is an unexpected error given that the dependencies should have been taken care of by MacPorts.

Does anybody have experience with MacPorts fortran installs?

I’m using Mavericks 10.9.5 on in Intel laptop if that helps.

Many thanks. Paul