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(autoconf.info)Preset Output Variables

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Preset Output Variables
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   Some output variables are preset by the Autoconf macros.  Some of the
Autoconf macros set additional output variables, which are mentioned in
the descriptions for those macros.  Note: Output Variable Index, for a
complete list of output variables.  Here is what each of the preset ones
contains.  *Note Variables for Installation Directories:
(standards)Directory Variables, for more information about the
variables with names that end in `dir'.

 - Variable: bindir
     The directory for installing executables that users run.

 - Variable: configure_input
     A comment saying that the file was generated automatically by
     `configure' and giving the name of the input file.  `AC_OUTPUT'
     adds a comment line containing this variable to the top of every
     `Makefile' it creates.  For other files, you should reference this
     variable in a comment at the top of each input file.  For example,
     an input shell script should begin like this:

          #! /bin/sh
          # @configure_input@

     The presence of that line also reminds people editing the file
     that it needs to be processed by `configure' in order to be used.

 - Variable: datadir
     The directory for installing read-only architecture-independent
     data.

 - Variable: exec_prefix
     The installation prefix for architecture-dependent files.

 - Variable: includedir
     The directory for installing C header files.

 - Variable: infodir
     The directory for installing documentation in Info format.

 - Variable: libdir
     The directory for installing object code libraries.

 - Variable: libexecdir
     The directory for installing executables that other programs run.

 - Variable: localstatedir
     The directory for installing modifiable single-machine data.

 - Variable: mandir
     The top-level directory for installing documentation in man format.

 - Variable: oldincludedir
     The directory for installing C header files for non-gcc compilers.

 - Variable: prefix
     The installation prefix for architecture-independent files.

 - Variable: sbindir
     The directory for installing executables that system
     administrators run.

 - Variable: sharedstatedir
     The directory for installing modifiable architecture-independent
     data.

 - Variable: srcdir
     The directory that contains the source code for that `Makefile'.

 - Variable: sysconfdir
     The directory for installing read-only single-machine data.

 - Variable: top_srcdir
     The top-level source code directory for the package.  In the
     top-level directory, this is the same as `srcdir'.

 - Variable: CFLAGS
     Debugging and optimization options for the C compiler.  If it is
     not set in the environment when `configure' runs, the default
     value is set when you call `AC_PROG_CC' (or empty if you don't).
     `configure' uses this variable when compiling programs to test for
     C features.

 - Variable: CPPFLAGS
     Header file search directory (`-IDIR') and any other miscellaneous
     options for the C preprocessor and compiler.  If it is not set in
     the environment when `configure' runs, the default value is empty.
     `configure' uses this variable when compiling or preprocessing
     programs to test for C features.

 - Variable: CXXFLAGS
     Debugging and optimization options for the C++ compiler.  If it is
     not set in the environment when `configure' runs, the default
     value is set when you call `AC_PROG_CXX' (or empty if you don't).
     `configure' uses this variable when compiling programs to test for
     C++ features.

 - Variable: FFLAGS
     Debugging and optimization options for the Fortran 77 compiler.
     If it is not set in the environment when `configure' runs, the
     default value is set when you call `AC_PROG_F77' (or empty if you
     don't).  `configure' uses this variable when compiling programs to
     test for Fortran 77 features.

 - Variable: DEFS
     `-D' options to pass to the C compiler.  If `AC_CONFIG_HEADER' is
     called, `configure' replaces `@DEFS@' with `-DHAVE_CONFIG_H'
     instead (Note: Configuration Headers).  This variable is not
     defined while `configure' is performing its tests, only when
     creating the output files.  Note: Setting Output Variables, for
     how to check the results of previous tests.

 - Variable: LDFLAGS
     Stripping (`-s') and any other miscellaneous options for the
     linker.  If it is not set in the environment when `configure' runs,
     the default value is empty.  `configure' uses this variable when
     linking programs to test for C features.

 - Variable: LIBS
     `-l' and `-L' options to pass to the linker.