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. See section Output Variable Index, for a complete list of output variables. Here is what each of the preset ones contains. See section `Variables for Installation Directories' in The GNU Coding Standards, 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 (see section Configuration Header Files). This variable is not defined while configure is performing its tests, only when creating the output files. See section 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.

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