I think that there is an Orca compiler for the Apple IIgs that is hosted under MPW.

Click to expand...

The Orca compiler you're thinking of is Orca/C and you can find it here:

http://store.syndicomm.com/index.php?main_page=product_info&cPath=0&products_id=131&zenid=a77743fe1f6bb3e3e3b17842b5a51103

along with several other programs for writing software for the GS on a Mac.

Just my small contribution,

Dean