Experimental ooRexx5

Forked from https://sourceforge.net/p/oorexx/code-0/HEAD/tree

• main/trunk

The goal of this repository is to apply to ooRexx5 some of the changes that were applied to oorRexx4 (Executor). A very low priority on my todo list.

Miscellaneous notes:

• JLF diary
• Executor internal notes
• Instructions to build Executor5 from scratch