Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide

TOOLS.INI example

[nmake]
.SUFFIXES: .pli
COMPILE_OPTS = gonumber source
.pli.obj:
  PLI $*.pli ($(COMPILE_OPTS)

These lines in the TOOLS.INI file do the following:

Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide