= Installation Guide

== Requirements

Ruby/GD requires version 1.6.0 or later of the gd library, and
Ruby-1.4.0 or later.

The latest version of gd is available from:
http://www.boutell.com/gd/

The latest version of Ruby is available from:
http://www.ruby-lang.org/

To build the extension library, at least the following libraries 
must be correctly installed in your system.

* libpng
* zlib

= Install

1. To generate the Makefile with which Ruby/GD is build, issue this
   command from your prompt:

   ruby extconf.rb [options...] 

   The following options can be specified:
   
   * --with-xpm

   If your gd has support for XPM format images, add this option. Note
   that libX11 and libXpm must be correctly installed in your system.
   
   * --with-ttf

   If your gd has support for TrueType fonts, add this option. Note that
   Freetype library must be correctly installed in your system.

   * --with-freetype

   If you want use the newest feature of font rendering provided by 
   gd-1.8.4, add this option along with '--with-ttf'. 
   Note that Freetype library must be correctly installed in your system. 

   * --with-jpeg

   If your gd has support for JPEG format images, add this option. Note that
   libjpeg-6b or later must be correctly installed in your system.

   * --with-gd-include=[dir], --with-gd-lib=[dir]

   You can specify explicitly the location in which gd library is
   installed.

   EXAMPLE
   the case libgd.a and header files exist in "/home/foo/gd-1.8.4":
   
   $ ruby extconf.rb --with-gd-include=/home/foo/gd-1.8.4 --with-gd-lib=/home/foo/gd-1.8.4

   * --enable-gd2_0

   If you want to use the newest features (support for truecolor
   images, alpha channels, etc.) provided by gd-2.0.x from Ruby/GD, 
   add this option. gd-2.0.x must be correctly installed on your system.

2. Build the extension library

   issue this command:

   $ make

   If successful, the library named "GD.so" is generated.

3. Install in your system

   type (if needed, as superuser)

   # make install
   or, 
   # make site-install

   and GD.so will be correctly installed in your system. This finishes
   the installation.