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NAME

       ifnames - Extract CPP conditionals from a set of files

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
       identifiers  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>.   GNU  Autoconf  home  page:
       <http://www.gnu.org/software/autoconf/>.   General   help   using   GNU
       software: <http://www.gnu.org/gethelp/>.

COPYRIGHT

       Copyright  (C) 2009 Free Software Foundation, Inc.  License GPLv2+: GNU
       GPL    version     2     or     later     <http://gnu.org/licenses/old-
       licenses/gpl-2.0.html>
       This  is  free  software:  you  are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

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  full  documentation for ifnames is maintained as a Texinfo manual.
       If the info and ifnames programs are properly installed at  your  site,
       the command

              info ifnames

       should give you access to the complete manual.