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Installation Instructions


Copyright © 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005 Free Software Foundation, Inc.

This file is free documentation; the Free Software Foundation gives unlimited permission to copy, distribute and modify it.

Basic Installation

These are generic installation instructions.

The configure' shell script attempts to guess correct values for various system-dependent variables used during compilation. It uses those values to create aMakefile' in each directory of the package. It may also create one or more .h' files containing system-dependent definitions. Finally, it creates a shell scriptconfig.status' that you can run in the future to recreate the current configuration, and a file config.log' containing compiler output (useful mainly for debuggingconfigure').

It can also use an optional file (typically called config.cache' and enabled with–cache-file=config.cache' or simply `-C') that saves the results of its tests to speed up reconfiguring. (Caching is disabled by default to prevent problems with accidental use of stale cache files.)

If you need to do unusual things to compile the package, please try to figure out how configure' could check whether to do them, and mail diffs or instructions to the address given in theREADME' so they can be considered for the next release. If you are using the cache, and at some point `config.cache' contains results you don’t want to keep, you may remove or edit it.

The file configure.ac' (orconfigure.in') is used to create configure' by a program calledautoconf'. You only need configure.ac' if you want to change it or regenerateconfigure' using a newer version of `autoconf'.

The simplest way to compile this package is:

  1. cd' to the directory containing the package's source code and type ./configure' to configure the package for your system. If you’re using csh' on an old version of System V, you might need to type sh ./configure' instead to prevent csh' from trying to execute configure' itself.

    Running `configure' takes awhile. While running, it prints some messages telling which features it is checking for.

  2. Type `make' to compile the package.

  3. Optionally, type `make check' to run any self-tests that come with the package.

  4. Type `make install' to install the programs and any data files and documentation.

  5. You can remove the program binaries and object files from the source code directory by typing make clean'. To also remove the files thatconfigure' created (so you can compile the package for a different kind of computer), type make distclean'. There is also amake maintainer-clean' target, but that is intended mainly for the package’s developers. If you use it, you may have to get all sorts of other programs in order to regenerate files that came with the distribution.

Compilers and Options

Some systems require unusual options for compilation or linking that the configure' script does not know about. Run./configure –help' for details on some of the pertinent environment variables.

You can give `configure' initial values for configuration parameters by setting variables in the command line or in the environment. Here is an example:

 ./configure CC=c89 CFLAGS=-O2 LIBS=-lposix

*Note Defining Variables::, for more details.

Compiling For Multiple Architectures

You can compile the package for more than one kind of computer at the same time, by placing the object files for each architecture in their own directory. To do this, you must use a version of make' that supports theVPATH' variable, such as GNU make'. cd' to the directory where you want the object files and executables to go and run the configure' script. configure' automatically checks for the source code in the directory that configure' is in and in..‘.

If you have to use a make' that does not support theVPATH' variable, you have to compile the package for one architecture at a time in the source code directory. After you have installed the package for one architecture, use `make distclean' before reconfiguring for another architecture.

Installation Names

By default, make install' installs the package's commands under /usr/local/bin', include files under /usr/local/include', etc. You can specify an installation prefix other than/usr/local' by giving configure' the option–prefix=PREFIX'.

You can specify separate installation prefixes for architecture-specific files and architecture-independent files. If you pass the option --exec-prefix=PREFIX' toconfigure', the package uses PREFIX as the prefix for installing programs and libraries. Documentation and other data files still use the regular prefix.

In addition, if you use an unusual directory layout you can give options like --bindir=DIR' to specify different values for particular kinds of files. Runconfigure –help' for a list of the directories you can set and what kinds of files go in them.

If the package supports it, you can cause programs to be installed with an extra prefix or suffix on their names by giving configure' the option–program-prefix=PREFIX' or `–program-suffix=SUFFIX'.

Optional Features

Some packages pay attention to --enable-FEATURE' options to configure', where FEATURE indicates an optional part of the package. They may also pay attention to --with-PACKAGE' options, where PACKAGE is something likegnu-as' or x' (for the X Window System). The README' should mention any --enable-' and–with-‘ options that the package recognizes.

For packages that use the X Window System, configure' can usually find the X include and library files automatically, but if it doesn't, you can use theconfigure' options --x-includes=DIR' and –x-libraries=DIR' to specify their locations.

Specifying the System Type

There may be some features configure' cannot figure out automatically, but needs to determine by the type of machine the package will run on. Usually, assuming the package is built to be run on the _same_ architectures,configure' can figure that out, but if it prints a message saying it cannot guess the machine type, give it the --build=TYPE' option. TYPE can either be a short name for the system type, such assun4', or a canonical name which has the form:

 CPU-COMPANY-SYSTEM

where SYSTEM can have one of these forms:

 OS KERNEL-OS

See the file config.sub' for the possible values of each field. If config.sub' isn’t included in this package, then this package doesn’t need to know the machine type.

If you are building compiler tools for cross-compiling, you should use the option `–target=TYPE' to select the type of system they will produce code for.

If you want to use a cross compiler, that generates code for a platform different from the build platform, you should specify the “host” platform (i.e., that on which the generated programs will eventually be run) with `–host=TYPE'.

Sharing Defaults

If you want to set default values for configure' scripts to share, you can create a site shell script calledconfig.site' that gives default values for variables like CC',cache_file', and prefix'. configure' looks for PREFIX/share/config.site' if it exists, then PREFIX/etc/config.site' if it exists. Or, you can set the CONFIG_SITE' environment variable to the location of the site script. A warning: not allconfigure' scripts look for a site script.

Defining Variables

Variables not defined in a site shell script can be set in the environment passed to configure'. However, some packages may run configure again during the build, and the customized values of these variables may be lost. In order to avoid this problem, you should set them in theconfigure' command line, using `VAR=value'. For example:

 ./configure CC=/usr/local2/bin/gcc

causes the specified `gcc' to be used as the C compiler (unless it is overridden in the site shell script). Here is a another example:

 /bin/bash ./configure CONFIG_SHELL=/bin/bash

Here the CONFIG_SHELL=/bin/bash' operand causes subsequent configuration-related scripts to be executed by/bin/bash'.

`configure' Invocation

`configure' recognizes the following options to control how it operates.

--help' -h' Print a summary of the options to `configure', and exit.

--version' -V' Print the version of Autoconf used to generate the `configure' script, and exit.

--cache-file=FILE' Enable the cache: use and save the results of the tests in FILE, traditionallyconfig.cache'. FILE defaults to `/dev/null' to disable caching.

--config-cache' -C' Alias for `–cache-file=config.cache'.

--quiet' –silent' -q' Do not print messages saying which checks are being made. To suppress all normal output, redirect it to/dev/null' (any error messages will still be shown).

--srcdir=DIR' Look for the package's source code in directory DIR. Usually configure' can determine that directory automatically.

configure' also accepts some other, not widely useful, options. Run configure –help' for more details.