GTK+ 2.0 Tutorial
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# Compiling Hello World

To compile use:

`gcc -Wall -g helloworld.c -o helloworld `pkg-config --cflags gtk+-2.0` \`
``pkg-config --libs gtk+-2.0``

This uses the program `pkg-config`, which can be obtained from www.freedesktop.org. This program reads the `.pc` which comes with GTK to determine what compiler switches are needed to compile programs that use GTK. `pkg-config --cflags gtk+-2.0` will output a list of include directories for the compiler to look in, and `pkg-config --libs gtk+-2.0` will output the list of libraries for the compiler to link with and the directories to find them in. In the above example they could have been combined into a single instance, such as `pkg-config --cflags --libs gtk+-2.0`.

Note that the type of single quote used in the compile command above is significant.

The libraries that are usually linked in are:

- The GTK library (`-lgtk`), the widget library, based on top of GDK.

- The GDK library (`-lgdk`), the Xlib wrapper.

- The gdk-pixbuf library (`-lgdk_pixbuf`), the image manipulation library.

- The Pango library (`-lpango`) for internationalized text.

- The gobject library (`-lgobject`), containing the type system on which GTK is based.

- The gmodule library (`-lgmodule`), which is used to load run time extensions.

- The GLib library (`-lglib`), containing miscellaneous functions; only g_print() is used in this particular example. GTK is built on top of GLib so you will always require this library. See the section on GLib for details.

- The Xlib library (`-lX11`) which is used by GDK.

- The Xext library (`-lXext`). This contains code for shared memory pixmaps and other X extensions.

- The math library (`-lm`). This is used by GTK for various purposes.

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