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+GtkGLArea is an OpenGL widget for GTK+ GUI toolkit.
+
+Just as GTK+ is built on top of GDK, GtkGLArea is built on top of gdkgl which
+is basically a wrapper around GLX functions. The widget itself is very
+similar to the GtkDrawingArea widget and adds only three extra functions.
+Lower level gdkgl functions make it easy to render on any OpenGL capable
+widget; rendering to off-screen pixmaps is also supported.
+
+This project appears to be abandoned in favor of GtkGLExt, but is still
+required by a few programs.