SYNOPSIS
       ifnames [OPTION] ...  [FILE] ...

DESCRIPTION
       Scan  all  of  the  C  source FILES (or the standard input, if none are
       given) and write to the standard output a sorted list of all the  iden-
       tifiers  that  appear  in  those  files in `#if', `#elif', `#ifdef', or
       `#ifndef' directives.  Print each identifier on a line, followed  by  a
       space-separated list of the files in which that identifier occurs.

       -h, --help
              print this help, then exit

       -V, --version
              print version number, then exit

AUTHOR
       Written by David J. MacKenzie and Paul Eggert.

REPORTING BUGS
       Report bugs to <bug-autoconf@gnu.org>.

COPYRIGHT
       Copyright (C) 2003 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is
       NO warranty; not even for MERCHANTABILITY or FITNESS FOR  A  PARTICULAR
       PURPOSE.

SEE ALSO
       autoconf(1),  automake(1), autoreconf(1), autoupdate(1), autoheader(1),
       autoscan(1), config.guess(1), config.sub(1), ifnames(1), libtool(1).

       The Debian project regards the full documentation  for  ifnames  to  be
       non-free,  so it is not included in Debian.  Nevertheless, the non-free
       distribution that accompanies Debian includes the manual in  its  auto-
       conf-doc  package.   Otherwise,  you may be able to access the Autoconf
       manual online.