AutoGen: 5.21 undefine option (-U)

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## 5.21 undefine option (-U)

This is the "definition list removal pattern" option.

This option has some usage constraints. It:

- may appear an unlimited number of times.
- may not be preset with environment variables or in initialization (rc) files.

Just like 'C', AutoGen uses `#ifdef/#ifndef` preprocessing directives. This option will cause the matching names to be removed from the list of defined values.

This document was generated by Bruce Korb on January, 8 2006 using texi2html 1.76.