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PLcairo is a set of Prolog bindings for the cairo graphics library. PLcairo provides the Prolog developer with an API to 2D vector-graphics that can be rendered on multiple output devices. PLcairo supports the following backends: Gtk, image buffers, PostScript, PDF, SVG. A number of short example programs exist in the plcairo/examples directory highlighting some of the capabilities of PLcairo. Installation ============ PLcairo has the following requirements: * SWI-Prolog  * PLGI  * cairo >= 1.12.0  * GObject Introspection >= 1.40  * pkg-config  The easiest way to install PLcairo is by using SWI-Prolog's package manager: ?- pack_install(plcairo). PLcairo can also be compiled and installed directly from sources in the following manner: % cd plcairo-$VERSION % autoconf % ./configure % make % make install  http://www.swi-prolog.org/  https://github.com/keriharris/plgi  http://cairographics.org/  https://wiki.gnome.org/Projects/GObjectIntrospection  http://www.freedesktop.org/wiki/Software/pkg-config/ License ======= PLcairo is free software and is available to be redistributed and/or modified under the terms of the GNU Lesser General Public License version 2.1 (LGPLv2.1).