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This file is free documentation; the Free Software Foundation gives unlimited permission to copy, distribute and modify it.
These are generic installation instructions.
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
config.log' containing compiler output (useful mainly for
It can also use an optional file (typically called
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
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.
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:
cd' to the directory containing the package's source code and type
./configure' to configure the package for your system. If you’re
csh' on an old version of System V, you might need to type
sh ./configure' instead to prevent
csh' from trying to execute
Running `configure' takes awhile. While running, it prints some messages telling which features it is checking for.
Type `make' to compile the package.
Optionally, type `make check' to run any self-tests that come with the package.
Type `make install' to install the programs and any data files and documentation.
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.
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.
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
supports theVPATH' variable, such as GNU
make'. cd' to the
directory where you want the object files and executables to go and run
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.
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
--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
option–program-prefix=PREFIX' or `–program-suffix=SUFFIX'.
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
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-libraries=DIR' to specify their locations.
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:
where SYSTEM can have one of these forms:
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'.
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
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.
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:
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
CONFIG_SHELL=/bin/bash' operand causes subsequent
configuration-related scripts to be executed by/bin/bash'.
`configure' recognizes the following options to control how it operates.
Print a summary of the options to `configure', and exit.
Print the version of Autoconf used to generate the `configure'
script, and exit.
Enable the cache: use and save the results of the tests in FILE,
traditionallyconfig.cache'. FILE defaults to `/dev/null' to
Alias for `–cache-file=config.cache'.
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).
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.