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+PTLib - Portable Tools Library
+
+PTLib is a moderately large class library that has it's genesis many
+years ago as PWLib (Portable Windows Library), a method to produce
+applications to run on both Microsoft Windows and Unix systems. It
+has also been ported to many other systems.
+Since then the system has grown to include many classes that assist
+in writing complete multi-platform applications. So it became a
+Portable Tools Library and was renamed to PTLib.
+
+libv4l is not strictly a prerequisite, but is strongly recommended.