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

       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
       <pfaffben@debian.org> for the Debian GNU/Linux autoconf2.13 package.

                                                    Autoconf                                          IFNAMES(1)

ifnames2.13  can help when writing a configure.in 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 configure.in 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:

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

       --macrodir=DIR-mDIR 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.

       --version
              Print the version number of Autoconf and exit.

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

autoconf2.13(1), autoheader2.13(1), autoreconf2.13(1), autoscan2.13(1), autoupdate2.13(1)

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