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README

unifdef (selectively processes C conditional compilation)

The unifdef utility selectively processes conditional C preprocessor
#if and #ifdef directives. It removes from a file both the directives
and the additional text that they delimit, while otherwise leaving the
file alone.

It is useful for avoiding distractions when studying code that uses
#ifdef heavily for portability: the author's original motivation was to
understand xterm's pty handling code. It can be used as a lightweight
preprocessor; for example the Linux kernel uses unifdef to strip out
#ifdef __KERNEL__ sections from the headers it exports to userland. You
can use unifdef with languages other than C; for example UIT, a
publisher in Cambridge, uses unifdef with LaTeX.