The installation procedure has changed since the posts above were written, and the correct method is shown as the output from './configure --help'.

In brief, the MCMA keyword must be added via the configure step, using the -a (or --add) option prior to compiling, with the syntax:
-a <keyword1,keyword2,...,keywordN>, --add <keyword1,keyword2,...,keywordN> 
         add the keywords to the final pref.dat