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gtk2/docs/reference/gtk/building.sgml
Owen Taylor d33fb32d4e Update directories in download locations; add information about fontconfig 
Fri Dec 20 13:10:06 2002  Owen Taylor  <otaylor@redhat.com>

        * gtk/building.sgml: Update directories in download
        locations; add information about fontconfig and Xft2.
2002-12-20 18:26:12 +00:00

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<refentry id="gtk-building" revision="6 Sept 2001">
<refmeta>
<refentrytitle>Compiling the GTK+ libraries</refentrytitle>
<manvolnum>3</manvolnum>
<refmiscinfo>GTK Library</refmiscinfo>
</refmeta>
<refnamediv>
<refname>Compiling the GTK+ Libraries</refname>
<refpurpose>
How to compile GTK+ itself
</refpurpose>
</refnamediv>
<refsect1 id="overview">
<title>Building GTK+ on UNIX-like systems</title>
<para>
This chapter covers building and installing GTK+ on UNIX and
UNIX-like systems such as Linux. Compiling GTK+ on Microsoft
Windows is different in detail and somewhat more difficult to
get going since the necessary tools aren't included with
the operating system.
</para>
<para>
Before we get into the details of how to compile GTK+, we should
mention that in many cases, binary packages of GTK+ prebuilt for
your operating system will be available, either from your
operating system vendor or from independent sources. If such a
set of packages is available, installing it will get you
programming wih GTK+ much faster than building it yourself. In
fact, you may well already have GTK+ installed on your system
already.
</para>
<para>
On UNIX-like systems GTK+ uses the standard GNU build system,
using <application>autoconf</application> for package
configuration and resolving portability issues,
<application>automake</application> for building makefiles that
comply with the GNU Coding Standards, and
<application>libtool</application> for building shared libraries
on multiple platforms.
</para>
<para>
If you are building GTK+ from the distributed source packages,
then won't need these tools installed; the necessary pieces
of the tools are already included in the source packages. But
it's useful to know a bit about how packages that use these
tools work. A source package is distributed as a
<literal>tar.gz</literal> file which you unpack into a
directory full of the source files as follows:
</para>
<programlisting>
tar xvfz gtk+-2.0.0.tar.gz
</programlisting>
<para>
In the toplevel of the directory that is created, there will be
a shell script called <filename>configure</filename> which
you then run to take the template makefiles called
<filename>Makefile.in</filename> in the package and create
makefiles customized for your operating system. The <filename>configure</filename>
script can be passed various command line arguments to determine how
the package is built and installed. The most commonly useful
argument is the <systemitem>--prefix</systemitem> argument which
determines where the package is installed. To install a package
in <filename>/opt/gtk</filename> you would run configure as:
</para>
<programlisting>
./configure --prefix=/opt/gtk
</programlisting>
<para>
A full list of options can be found by running
<filename>configure</filename> with the
<systemitem>--help</systemitem> argument. In general, the defaults are
right and should be trusted. After you've run
<filename>configure</filename>, you then run the
<command>make</command> command to build the package and install
it.
</para>
<programlisting>
make
make install
</programlisting>
<para>
If you don't have permission to write to the directory you are
installing in, you may have to change to root temporarily before
running <literal>make install</literal>. Also, if you are
installing in a system directory, on some systems (such as
Linux), you will need to run <command>ldconfig</command> after
<literal>make install</literal> so that the newly installed
libraries will be found.
</para>
<para>
Several environment variables are useful to pass to set before
running configure. <envar>CPPFLAGS</envar> contains options to
pass to the C compiler, and is used to tell the compiler where
to look for include files. The <envar>LDFLAGS</envar> variable
is used in a similar fashion for the linker. Finally the
<envar>PKG_CONFIG_PATH</envar> environment variable contains
a search path that <command>pkg-config</command> (see below)
uses when looking for for file describing how to compile
programs using different libraries. If you were installing GTK+
and it's dependencies into <filename>/opt/gtk</filename>, you might want to set
these variables as:
</para>
<programlisting>
CPPFLAGS="-I/opt/gtk/include"
LDFLAGS="-L/opt/gtk/lib"
PKG_CONFIG_PATH="/opt/gtk/lib/pkgconfig"
export CPPFLAGS LDFLAGS PKG_CONFIG_PATH
</programlisting>
<para>
You may also need to set the <envar>LD_LIBRARY_PATH</envar>
environment variable so the systems dynamic linker can find
the newly installed libraries, and the <envar>PATH</envar>
environment program so that utility binaries installed by
the various libraries will be found.
</para>
<programlisting>
LD_LIBRARY_PATH="/opt/gtk/lib"
PATH="/opt/gtk/bin:$PATH"
export LD_LIBRARY_PATH PATH
</programlisting>
</refsect1>
<refsect1 id="dependencies">
<title>Dependencies</title>
<para>
Before you can compile the GTK+ widget toolkit, you need to have
various other tools and libraries installed on your
system. The two tools needed during the build process (as
differentiated from the tools used in when creating GTK+
mentioned above such as <application>autoconf</application>)
are <command>pkg-config</command> and GNU make.
</para>
<itemizedlist>
<listitem>
<para>
<ulink
url="http://www.freedesktop.org/software/pkgconfig/">pkg-config</ulink>
is a tool for tracking the compilation flags needed for
libraries that is used by the GTK+ libraries. (For each
library, a small <literal>.pc</literal> text file is installed in a standard
location that contains the compilation flags needed for that
library along with version number information.) The version
of <command>pkg-config</command> needed to build GTK+ is
mirrored in the <filename>dependencies</filename> directory
on the <ulink url="ftp://ftp.gtk.org/pub/gtk/v2.2/">GTK+ FTP
site.</ulink>
</para>
</listitem>
<listitem>
<para>
The GTK+ makefiles will mostly work with different versions
of <command>make</command>, however, there tends to be
a few incompatibilities, so the GTK+ team recommends
installing <ulink url="http://www.gnu.org/software/make">GNU
make</ulink> if you don't already have it on your system
and using it. (It may be called <command>gmake</command>
rather than <command>make</command>.)
</para>
</listitem>
</itemizedlist>
<para>
Three of the libraries that GTK+ depends on are maintained by
by the GTK+ team: GLib, Pango, and ATK. Other libraries are
maintained separately.
</para>
<itemizedlist>
<listitem>
<para>
The GLib library provides core non-graphical functionality
such as high level data types, Unicode manipulation, and
a object and type system to C programs. It is available
from the <ulink url="ftp://ftp.gtk.org/pub/gtk/v2.2/">GTK+
FTP site.</ulink>
</para>
</listitem>
<listitem>
<para>
<ulink url="http://www.pango.org">Pango</ulink> is a library
for internationalized text handling. Itis available from
the <ulink url="ftp://ftp.gtk.org/pub/gtk/v2.2/">GTK+ FTP
site.</ulink>. Either Pango-1.0 or Pango-1.2 can be used
with GTK+-2.2, though Pango-1.2 is recommended.
</para>
</listitem>
<listitem>
<para>
ATK is the Accessibility Toolkit. It provides a set of generic
interfaces allowing accessibility technologies such as
screen readers to interact with a graphical user interface.
It is available from the <ulink
url="ftp://ftp.gtk.org/pub/gtk/v2.2/">GTK+ FTP site.</ulink>
</para>
</listitem>
<listitem>
<para>
The <ulink url="http://www.gnu.org/software/libiconv/">GNU
libiconv library</ulink> is needed to build GLib if your
system doesn't have the <function>iconv()</function>
function for doing conversion between character
encodings. Most modern systems should have
<function>iconv()</function>.
</para>
</listitem>
<listitem>
<para>
The libintl library from the <ulink
url="http://www.gtk.org/software/gettext">GNU gettext
package</ulink> is needed if your system doesn't have the
<function>gettext()</function> functionality for handling
message translation databases.
</para>
</listitem>
<listitem>
<para>
The <ulink
url="ftp://ftp.uu.net/graphics/jpeg/">JPEG</ulink>,
<ulink url="http://www.libpng.org">PNG</ulink>, and
<ulink url="http://www.libtiff.org">TIFF</ulink> image loading libraries are needed to
compile GTK+. You probably already have these libraries
installed, but if not, the versions you need are available in
the <filename>dependencies</filename> directory on the the
<ulink url="ftp://ftp.gtk.org/pub/gtk/v2.2/dependencies/">GTK+
FTP site.</ulink>. (Before installing these libraries
from source, you should check if your operating system
vendor has prebuilt packages of these libraries that you
don't have installed.)
</para>
</listitem>
<listitem>
<para>
The libraries from the X window system are needed to build
Pango and GTK+. You should already have these installed on
your system, but it's possible that you'll need to install
the development environment for these libraries that your
operating system vendor provides.
</para>
</listitem>
<listitem>
<para>
The <ulink url="http://www.fontconfig.org">fontconfig</ulink>
library provides Pango with a standard way of locating
fonts and matching them against font names. The Xft2
library, distributed with fontconfig, provide support for
scaleable and antialiased fonts on X. Pango includes two
backends that work on top of fontconfig: an Xft2 backend
and a backend that uses fontconfig and the underlying
<ulink url="http://www.freetype.org">FreeType
library</ulink> directly. Neither backend is mandatory, but the
Xft2 backend is the preferred backend for X and the FreeType
backend is needed by many applications.
</para>
</listitem>
</itemizedlist>
</refsect1>
<refsect1 id="building">
<title>Building and testing GTK+</title>
<para>
First make sure that you have the necessary external
dependencies installed: <command>pkg-config</command>, GNU make,
the JPEG, PNG, and TIFF libraries, FreeType, and, if necessary,
libiconv and libintl. To get detailed information about building
these packages, see the documentation provided with the
individual packages.
On a Linux system, it's quite likely you'll have all of these
installed already except for <command>pkg-config</command>.
</para>
<para>
Then build and install the GTK+ libraries in the order:
GLib, Pango, ATK, then GTK+. For each library, follow the
steps of <literal>configure</literal>, <literal>make</literal>,
<literal>make install</literal> mentioned above. If you're
lucky, this will all go smoothly, and you'll be ready to
<link linkend="gtk-compiling">start compiling your own GTK+
applications</link>. You can test your GTK+ installation
by running the <command>gtk-demo</command> program that
GTK+ installs.
</para>
<para>
If one of the <filename>configure</filename> scripts fails or running
<command>make</command> fails, look closely at the error
messages printed; these will often provide useful information
as to what went wrong. When <filename>configure</filename>
fails, extra information, such as errors that a test compilation
ran into, is found in the file <filename>config.log</filename>.
Looking at the last couple of hundred lines in this file will
frequently make clear what went wrong. If all else fails, you
can ask for help on the gtk-list mailing list.
See <xref linkend="gtk-resources"/> for more information.
</para>
</refsect1>
<refsect1 id="extra-configuration-options">
<title>Extra Configuration Options</title>
<para>
In addition to the normal options, the
<command>configure</command> script for the GTK+ library
supports a number of additional arguments. (Command line
arguments for the other GTK+ libraries are described in
the documentation distributed with the those libraries.)
<cmdsynopsis>
<command>configure</command>
<group>
<arg>--disable-modules</arg>
<arg>--enable-modules</arg>
</group>
<group>
<arg>--with-included-loaders==LOADER1,LOADER2,...</arg>
</group>
<group>
<arg>--enable-debug=[no|minimum|yes]</arg>
</group>
<group>
<arg>--disable-shm</arg>
<arg>--enable-shm</arg>
</group>
<group>
<arg>--disable-xim</arg>
<arg>--enable-xim</arg>
</group>
<group>
<arg>--disable-xim-inst</arg>
<arg>--enable-xim-inst</arg>
</group>
<group>
<arg>--disable-xkb</arg>
<arg>--enable-xkb</arg>
</group>
<group>
<arg>--disable-gtk-doc</arg>
<arg>--enable-gtk-doc</arg>
</group>
<group>
<arg>--with-xinput=[no|yes]</arg>
</group>
<group>
<arg>--with-gdktarget=[x11|linux-fb|win32]</arg>
</group>
<group>
<arg>--disable-shadowfb</arg>
<arg>--enable-shadowfb</arg>
</group>
</cmdsynopsis>
</para>
<formalpara>
<title><systemitem>--disable-modules</systemitem> and
<systemitem>--enable-modules</systemitem></title>
<para>
Normally GTK+ will try to build the GdkPixbuf image file
format loaders as little shared libraries that are loaded on
demand. The <systemitem>--disable-modules</systemitem>
argument indicates that they should all be built statically
into the GTK+ library instead. This is useful for
people who need to produce statically-linked binaries. If
neither <systemitem>--disable-modules</systemitem> nor
<systemitem>--enable-modules</systemitem> is specified, then
the <command>configure</command> script will try to
auto-detect whether shared modules work on your system.
</para>
</formalpara>
<formalpara>
<title><systemitem>--with-included-loaders</systemitem></title>
<para>
This option allows you to specify which image loaders you
want to include; for example, you might include only the PNG
loader to create a smaller GdkPixbuf binary.
</para>
</formalpara>
<formalpara>
<title><systemitem>--enable-debug</systemitem></title>
<para>
Turns on various amounts of debugging support. Setting this to 'no'
disables g_assert(), g_return_if_fail(), g_return_val_if_fail() and
all cast checks between different object types. Setting it to 'minimum'
disables only cast checks. Setting it to 'yes' enables
<link linkend="GTK-Debug-Options">runtime debugging</link>.
The default is 'minimum'.
Note that 'no' is fast, but dangerous as it tends to destabilize
even mostly bug-free software by changing the effect of many bugs
from simple warnings into fatal crashes. Thus
<option>--enable-debug=no</option> should <emphasis>not</emphasis>
be used for stable releases of GTK+.
</para>
</formalpara>
<formalpara>
<title><systemitem>--enable-explicit-deps</systemitem> and
<systemitem>--disable-explicit-deps</systemitem></title>
<para>
If <systemitem>--enable-explicit-deps</systemitem> is
specified then GTK+ will write the full set of libraries
that GTK+ depends upon into its <literal>.pc</literal> files to be used when
programs depending on GTK+ are linked. Otherwise, GTK+
only will include the GTK+ libraries themselves, and
will depend on system library dependency facilities to
bring in the other libraries.
By default GTK+ will disable explicit dependencies unless
it detects that they are needed on the system. (If you
specify <systemitem>--enable-static</systemitem> to force
building of static libraries, then explicit dependencies
will be written since library dependencies don't work
for static libraries.) Specifying
<systemitem>--enable-explicit-deps</systemitem> or
<systemitem>--enable-static</systemitem> can cause
compatibility
problems when libraries that GTK+ depends upon change
their versions, and should be avoided if possible.
</para>
</formalpara>
<formalpara>
<title><systemitem>--disable-shm</systemitem> and
<systemitem>--enable-shm</systemitem></title>
<para>
These options can be used to control whether GTK+ will use shared
memory to communicate with the X server when possible.
The default is 'yes'.
</para>
</formalpara>
<formalpara>
<title><systemitem>--disable-xim</systemitem> and
<systemitem>--enable-xim</systemitem></title>
<para>
These options can be used to control whether GTK+ will
be compiled with support for XIM. (The X Input Method
extension, used for Japanese input.) The default is yes.
</para>
</formalpara>
<formalpara>
<title><systemitem>--disable-xim-inst</systemitem> and
<systemitem>--enable-xim-inst</systemitem></title>
<para>
These options determine whether GTK+ will use the
XIM instantiate callback.
The default is 'yes', unless the host system is Solaris,
where <function>XRegisterIMInstantiateCallback()</function>
seems to cause a segfault.
</para>
</formalpara>
<formalpara>
<title><systemitem>--disable-xkb</systemitem> and
<systemitem>--enable-xkb</systemitem></title>
<para>
By default the <command>configure</command> script will try
to auto-detect whether the XKB extension is supported by
the X libraries GTK+ is linked with.
These options can be used to explicitly control whether
GTK+ will support the XKB extension.
</para>
</formalpara>
<formalpara>
<title><systemitem>--disable-gtk-doc</systemitem> and
<systemitem>--enable-gtk-doc</systemitem></title>
<para>
The <application>gtk-doc</application> package is
used to generate the reference documentation included
with GTK+. By default support for <application>gtk-doc</application>
is disabled because it requires various extra dependencies
to be installed. If you have
<application>gtk-doc</application> installed and
are modifying GTK+, you may want to enable
<application>gtk-doc</application> support by passing
in <systemitem>--enable-gtk-doc</systemitem>. If not
enabled, pre-generated HTML files distributed with GTK+
will be installed.
</para>
</formalpara>
<formalpara>
<title><systemitem>--with-xinput</systemitem></title>
<para>
Controls whether GTK+ is built with support for the XInput
extension. The XInput extension provides an interface
to extended input devices such as graphics tablets.
When this support is compiled in, specially written
GTK+ programs can get access to subpixel positions,
multiple simultaneous input devices, and extra "axes"
provided by the device such as pressure and tilt
information. This is only known to work well on XFree86
systems, though other systems do have this extension.
</para>
</formalpara>
<formalpara>
<title><systemitem>--with-gdktarget</systemitem></title>
<para>
Toggles between the supported backends for GDK.
The default is x11, unless the platform is Windows, in which
case the default is win32.
</para>
</formalpara>
<formalpara>
<title><systemitem>--disable-shadowfb</systemitem> and
<systemitem>--enable-shadowfb</systemitem></title>
<para>
Toggles shadow framebuffer support for the linux-fb target,
if selected.
</para>
</formalpara>
</refsect1>
</refentry>
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