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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, a file

`config.cache' that saves the results of its tests to speed up

reconfiguring, and a file `config.log' containing compiler output

(useful mainly for debugging `configure').

   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 at some point `config.cache'

contains results you don't want to keep, you may remove or edit it.

   The file `configure.in' is used to create `configure' by a program

called `autoconf'.  You only need `configure.in' 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 a while.  While running, it prints some

     messages telling which features it is checking for.

  2. Type `make' to compile the package.

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

     documentation.

  4. You can remove the program binaries and object files from the

     source code directory by typing `make clean'.  

Compilers and Options

=====================

   Some systems require unusual options for compilation or linking that

the `configure' script does not know about.  You can give `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:

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

Or on systems that have the `env' program, you can do it like this:

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

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 supports 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.

   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' can not figure out

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

will run on.  Usually `configure' can figure that out, but if it prints

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

`--host=TYPE' option.  TYPE can either be a short name for the system

type, such as `sun4', or a canonical name with three fields:

     CPU-COMPANY-SYSTEM

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 host type.

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

use the `--target=TYPE' option to select the type of system they will

produce code for and the `--build=TYPE' option to select the type of

system on which you are compiling the package.

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.

Operation Controls

==================

   `configure' recognizes the following options to control how it

operates.

`--cache-file=FILE'

     Use and save the results of the tests in FILE instead of

     `./config.cache'.  Set FILE to `/dev/null' to disable caching, for

     debugging `configure'.

`--help'

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

`--quiet'

`--silent'

`-q'

     Do not print messages saying which checks are being made.

`--srcdir=DIR'

     Look for the package's source code in directory DIR.  Usually

     `configure' can determine that directory automatically.

`--version'

     Print the version of Autoconf used to generate the `configure'

     script, and exit.

`configure' also accepts some other, not widely useful, options.