(autoconf.info)Preset Output Variables

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3.3.1 Preset Output Variables
-----------------------------

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.