@c This file is included by autoconf.texi and is used to produce

@c the INSTALL file.

@node Basic Installation

@section Basic Installation

These are generic installation instructions.

The @code{configure} shell script attempts to guess correct values for

various system-dependent variables used during compilation.  It uses

those values to create a @file{Makefile} in each directory of the

package.  It may also create one or more @file{.h} files containing

system-dependent definitions.  Finally, it creates a shell script

@file{config.status} that you can run in the future to recreate the

current configuration, a file @file{config.cache} that saves the results

of its tests to speed up reconfiguring, and a file @file{config.log}

containing compiler output (useful mainly for debugging

@code{configure}).

If you need to do unusual things to compile the package, please try to

figure out how @code{configure} could check whether to do them, and mail

diffs or instructions to the address given in the @file{README} so they

can be considered for the next release.  If at some point

@file{config.cache} contains results you don't want to keep, you may

remove or edit it.

The file @file{configure.in} is used to create @file{configure} by a

program called @code{autoconf}.  You only need @file{configure.in} if

you want to change it or regenerate @file{configure} using a newer

version of @code{autoconf}.

@noindent

The simplest way to compile this package is:

@enumerate

@item

@code{cd} to the directory containing the package's source code and type

@samp{./configure} to configure the package for your system.  If you're

using @code{csh} on an old version of System V, you might need to type

@samp{sh ./configure} instead to prevent @code{csh} from trying to

execute @code{configure} itself.

Running @code{configure} takes awhile.  While running, it prints some

messages telling which features it is checking for.

@item

Type @samp{make} to compile the package.

@item

Optionally, type @samp{make check} to run any self-tests that come with

the package.

@item

Type @samp{make install} to install the programs and any data files and

documentation.

@item

You can remove the program binaries and object files from the source code

directory by typing @samp{make clean}.  To also remove the files that

@code{configure} created (so you can compile the package for a different

kind of computer), type @samp{make distclean}.  There is also a

@samp{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.

@end enumerate

@node Compilers and Options

@section Compilers and Options

Some systems require unusual options for compilation or linking that

the @code{configure} script does not know about.  You can give

@code{configure} initial values for variables by setting them in the

environment.  Using a Bourne-compatible shell, you can do that on the

command line like this:

@example

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

@end example

@noindent

Or on systems that have the @code{env} program, you can do it like this:

@example

env CPPFLAGS=-I/usr/local/include LDFLAGS=-s ./configure

@end example

@node Multiple Architectures

@section 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 @code{make} that

supports the @code{VPATH} variable, such as GNU @code{make}.  @code{cd}

to the directory where you want the object files and executables to go

and run the @code{configure} script.  @code{configure} automatically

checks for the source code in the directory that @code{configure} is in

and in @file{..}.

If you have to use a @code{make} that does not supports the @code{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 @samp{make distclean} before reconfiguring for

another architecture.

@node Installation Names

@section Installation Names

By default, @samp{make install} will install the package's files in

@file{/usr/local/bin}, @file{/usr/local/man}, etc.  You can specify an

installation prefix other than @file{/usr/local} by giving

@code{configure} the option @samp{--prefix=@var{path}}.

You can specify separate installation prefixes for architecture-specific

files and architecture-independent files.  If you give @code{configure}

the option @samp{--exec-prefix=@var{path}}, the package will use

@var{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 @samp{--bindir=@var{path}} to specify different values for

particular kinds of files.  Run @samp{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 @code{configure} the

option @samp{--program-prefix=@var{PREFIX}} or

@samp{--program-suffix=@var{SUFFIX}}.

@node Optional Features

@section Optional Features

Some packages pay attention to @samp{--enable-@var{feature}} options to

@code{configure}, where @var{feature} indicates an optional part of the

package.  They may also pay attention to @samp{--with-@var{package}}

options, where @var{package} is something like @samp{gnu-as} or @samp{x}

(for the X Window System).  The @file{README} should mention any

@samp{--enable-} and @samp{--with-} options that the package recognizes.

For packages that use the X Window System, @code{configure} can usually

find the X include and library files automatically, but if it doesn't,

you can use the @code{configure} options @samp{--x-includes=@var{dir}}

and @samp{--x-libraries=@var{dir}} to specify their locations.

@node System Type

@section Specifying the System Type

There may be some features @code{configure} can not figure out

automatically, but needs to determine by the type of host the package

will run on.  Usually @code{configure} can figure that out, but if it

prints a message saying it can not guess the host type, give it the

@samp{--host=@var{type}} option.  @var{type} can either be a short name

for the system type, such as @samp{sun4}, or a canonical name with three

fields:

@example

@var{cpu}-@var{company}-@var{system}

@end example

@noindent

See the file @file{config.sub} for the possible values of each field.

If @file{config.sub} isn't included in this package, then this package

doesn't need to know the host type.

If you are building compiler tools for cross-compiling, you can also use

the @samp{--target=@var{type}} option to select the type of system

they will produce code for and the @samp{--build=@var{type}} option

to select the type of system on which you are compiling the package.

@node Sharing Defaults

@section Sharing Defaults

If you want to set default values for @code{configure} scripts to share,

you can create a site shell script called @file{config.site} that gives

default values for variables like @code{CC}, @code{cache_file}, and

@code{prefix}.  @code{configure} looks for

@file{@var{prefix}/share/config.site} if it exists, then

@file{@var{prefix}/etc/config.site} if it exists.  Or, you can set

the @code{CONFIG_SITE} environment variable to the location of the site

script.  A warning: not all @code{configure} scripts look for a site script.

@node Operation Controls

@section Operation Controls

@code{configure} recognizes the following options to control how it

operates.

@table @code

@item --cache-file=@var{file}

Use and save the results of the tests in @var{file} instead of

@file{./config.cache}.  Set @var{file} to @file{/dev/null} to disable

caching, for debugging @code{configure}.

@item --help

Print a summary of the options to @code{configure}, and exit.

@item --quiet

@itemx --silent

@itemx -q

Do not print messages saying which checks are being made.

To suppress all normal output, redirect it to @file{/dev/null}

(any error messages will still be shown).

@item --srcdir=@var{dir}

Look for the package's source code in directory @var{dir}.  Usually

@code{configure} can determine that directory automatically.

@item --version

Print the version of Autoconf used to generate the @code{configure}

script, and exit.

@end table

@noindent

@code{configure} also accepts some other, not widely useful, options.