Unable to read or compile a file

[Domicile]

Hi

I work on an iMac 10.14.6

I have installed the GNU Prolog.

When I try to compile a file (for example queens.pl) by [queens]. I get the message :

uncaught exception: error(system_error('error trying to execute pl2wam (maybe not found)'),consult/1)

Same if I try to compile by ./gplc queens.pl from the directory where gprolog and gplc are located.

And no INSTALL file found.

Thank you for the reply

Yves Tourmen