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

/DEF

Read syntax diagramSkip visual syntax diagram>>-/DEF--:filename---------------------------------------------><
 

Use /DEF to specify the name of the .def file to use to get information about exported symbols and linker parameters.

This option is not required, since ILIB will recognize .def files by their contents if they are placed with other input files on the command line.

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