Copyright 1994, 1995, 1996, 1999, 2000, 2001, 2002 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 a `Makefile' in each directory of the package. | |
It may also create one or more `.h' files containing system-dependent | |
definitions. Finally, it creates a shell script `config.status' that | |
you can run in the future to recreate the current configuration, and a | |
file `config.log' containing compiler output (useful mainly for | |
debugging `configure'). | |
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 the `README' 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' (or `configure.in') is used to create | |
`configure' by a program called `autoconf'. You only need | |
`configure.ac' if you want to change it or regenerate `configure' 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 that `configure' created (so you can compile the package for | |
a different kind of computer), type `make distclean'. There is | |
also a `make 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 the `VPATH' 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 the `VPATH' | |
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' will install the package's files in | |
`/usr/local/bin', `/usr/local/man', etc. You can specify an | |
installation prefix other than `/usr/local' by giving `configure' the | |
option `--prefix=PATH'. | |
You can specify separate installation prefixes for | |
architecture-specific files and architecture-independent files. If you | |
give `configure' the option `--exec-prefix=PATH', the package will use | |
PATH as the prefix for installing programs and libraries. | |
Documentation and other data files will still use the regular prefix. | |
In addition, if you use an unusual directory layout you can give | |
options like `--bindir=PATH' to specify different values for particular | |
kinds of files. Run `configure --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 like `gnu-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 the `configure' 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 as `sun4', 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 `--target=TYPE' option 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 called `config.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 all `configure' 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 the `configure' command line, using `VAR=value'. For example: | |
./configure CC=/usr/local2/bin/gcc | |
will cause the specified gcc to be used as the C compiler (unless it is | |
overridden in the site shell script). | |
`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, | |
traditionally `config.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. | |