JPEGView/Independent JPEG Group/install.doc

INSTALLATION INSTRUCTIONS for the Independent JPEG Group's JPEG software

Copyright (C) 1991-1994, Thomas G. Lane.
This file is part of the Independent JPEG Group's software.
For conditions of distribution and use, see the accompanying README file.


This file explains how to configure and install the IJG software.  We have
tried to make this software extremely portable and flexible, so that it can be
adapted to almost any environment.  The downside of this decision is that the
installation process is complicated.  We have provided shortcuts to simplify
the task on common systems.  But in any case, you will need at least a little
familiarity with C programming and program build procedures for your system.

If you are only using this software as part of a larger program, the larger
program's installation procedure may take care of configuring the IJG code.
For example, Ghostscript's installation script will configure the IJG code.
You don't need to read this file if you just want to compile Ghostscript.

In this alpha-test release, the "configure" script is brand new and should not
be trusted.  Please try it, if you are on a Unix machine; but please also read
the hand-installation instructions, and verify that configure produced
reasonable Makefile and jconfig.h files.  Also, I have not been able to test
the canned makefiles and jconfig files for non-Unix machines.  Please report
any problems to jpeg-info@uunet.uu.net.


TABLE OF CONTENTS
-----------------

Before you start
Configuring the software:
	using the automatic "configure" script
	using one of the supplied jconfig and makefile files
	by hand
Building the software
Testing the software
Installing the software
Optional stuff
Optimization
Hints for specific systems


BEFORE YOU START
================

Before installing the software you must unpack the distributed source code.
Since you are reading this file, you have probably already succeeded in this
task.  However, there is a potential for error if you needed to convert the
files to the local standard text file format (for example, if you are on
MS-DOS you may have converted LF end-of-line to CR/LF).  You must apply
such conversion to all the files EXCEPT those whose names begin with "test".
The test files contain binary data; if you change them in any way then the
self-test will give bad results.

Please check the last section of this file to see if there are hints for the
specific machine or compiler you are using.


CONFIGURING THE SOFTWARE
========================

To configure the IJG code for your system, you need to create two files:
  * jconfig.h: contains values for system-dependent #define symbols.
  * Makefile: controls the compilation process.
(On a non-Unix machine, you may create "project files" or some other
substitute for a Makefile.  jconfig.h is needed in any environment.)

We provide three different ways to generate these files:
  * On a Unix system, you can just run the "configure" script.
  * We provide sample jconfig files and makefiles for popular machines;
    if your machine matches one of the samples, just copy the right sample
    files to jconfig.h and Makefile.
  * If all else fails, read the instructions below and make your own files.


Configuring the software using the automatic "configure" script
---------------------------------------------------------------

If you are on a Unix machine, you can just type
	./configure
and let the configure script construct appropriate configuration files.
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.
Expect configure to run for a few minutes, particularly on slower machines;
it works by compiling a series of test programs.

Configure was created with GNU Autoconf and it follows the usual conventions
for GNU configure scripts.  It makes a few assumptions that you may want to
override.  You can do this by providing optional switches to configure:

* Configure will use gcc (GNU C compiler) if it's available, otherwise cc.
To force a particular