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       ifnames2.13  -  print identifiers that a package uses in C preprocessor


       ifnames2.13 [ --help | -h ] [ --macrodir=dir | -m dir ] [ --version ]


       ifnames2.13 can  help  when  writing  a  for  a  software
       package.   It prints the identifiers that the package already uses in C
       preprocessor conditionals.  If a package has already  been  set  up  to
       have  some  portability,  this program can help you figure out what its
       configure needs to check for.  It may help  fill  in  some  gaps  in  a generated by autoscan2.13 (see autoscan2.13(1)).

       ifnames2.13  scans  all of the C source files named on the command line
       (or the standard input, if none are given) and writes to  the  standard
       output  a sorted list of all the identifiers that appear in those files
       in  #if,  #elif,  #ifdef,  or  #ifndef  directives.   It  prints   each
       identifier  on  a line, followed by a space-separated list of the files
       in which that identifier occurs.

       ifnames2.13 accepts the following options:


       -h     Print a summary of the command line options and exit.


       -m DIR Look for the installed macro files in directory  DIR.   You  can
              also  set  the  AC_MACRODIR environment variable to a directory;
              this option overrides the environment variable.

              Print the version number of Autoconf and exit.


       autoconf2.13(1), autoheader2.13(1), autoreconf2.13(1), autoscan2.13(1),


       David  MacKenzie,  with help from Franc,ois Pinard, Karl Berry, Richard
       Pixley, Ian Lance Taylor, Roland McGrath, Noah Friedman, David D. Zuhn,
       and    many    others.     This    manpage   written   by   Ben   Pfaff
       <> for the Debian GNU/Linux autoconf2.13 package.

                                   Autoconf                         IFNAMES(1)