NAME

       autoheader2.13 - creates a template file of C #define's for use by configure.

SYNOPSIS

       autoheader2.13  [  --help | -h ] [ --localdir=dir | -l dir ] [ --macrodir=dir | -m dir ] [
       --version ]

DESCRIPTION

       The autoheader2.13 program can  create  a  template  file  of  C  #define  statements  for
       configure  to use.  If configure.in invokes AC_CONFIG_HEADER(FILE), autoheader2.13 creates
       FILE.in; if multiple file  arguments  are  given,  the  first  one  is  used.   Otherwise,
       autoheader2.13 creates config.h.in.

       If  you  give  autoheader2.13  an  argument, it uses that file instead of configure.in and
       writes the header file to the standard output instead of  to  config.h.in.   If  you  give
       autoheader2.13  an  argument of -, it reads the standard input instead of configure.in and
       writes the header file to the standard output.

       autoheader2.13 scans configure.in and figures out which C preprocessor  symbols  it  might
       define.   It  copies  comments  and  #define  and  #undef  statements  from  a file called
       acconfig.h, which comes with and is installed with Autoconf.  It also uses a  file  called
       acconfig.h in the current directory, if present.  If you AC_DEFINE any additional symbols,
       you must create that file with entries for them.  For symbols defined by AC_CHECK_HEADERS,
       AC_CHECK_FUNCS,  AC_CHECK_SIZEOF,  or  AC_CHECK_LIB, autoheader2.13 generates comments and
       #undef statements itself rather than copying them from a file, since the possible  symbols
       are effectively limitless.

       The  file  that  autoheader2.13  creates contains mainly #define and #undef statements and
       their accompanying comments.  If ./acconfig.h contains the  string  @TOP@,  autoheader2.13
       copies  the  lines  before  the  line  containing  @TOP@  into the top of the file that it
       generates.  Similarly, if ./acconfig.h contains the string @BOTTOM@, autoheader2.13 copies
       the  lines  after  that line to the end of the file it generates.  Either or both of those
       strings may be omitted.

       An alternate way to produce the same effect is to create  the  files  FILE.top  (typically
       config.h.top)  and/or  FILE.bot  in  the current directory.  If they exist, autoheader2.13
       copies them to the  beginning  and  end,  respectively,  of  its  output.   Their  use  is
       discouraged  because  they  have  file  names  that contain two periods, and so can not be
       stored on MS-DOS; also, they are two more files to clutter up the directory.  But  if  you
       use  the  --localdir=DIR option to use an acconfig.h in another directory, they give you a
       way to put custom boilerplate in each individual config.h.in.

       autoheader2.13 accepts the following options:

       --help

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

       --localdir=DIR

       -l DIR Look for the  package  files  aclocal.m4  and  acconfig.h  (but  not  FILE.top  and
              FILE.bot) in directory DIR instead of in the current directory.

       --macrodir=DIR

       -m DIR Look  for  the installed macro files and acconfig.h 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.

SEE ALSO

       autoconf2.13(1), autoreconf2.13(1), autoscan2.13(1), autoupdate2.13(1), ifnames2.13(1)

AUTHORS

       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                               AUTOHEADER(1)