xthe built from THE-3.2RC2 sources gives an error message (for example, with a macro named mast); enter "macro mast ". This message is given, "sh: mast: command not found".
Regina is at REXX-Regina_3.7(MT) 5.00 14 Oct 2012.
This problem appears with ooRexx as well. :-)
I'm willing to test any changes or run any test cases needed.