+To use the pb_syshdr.h, define *PB_SYSTEM_HEADER* to be the name of your custom
+header file. It should provide all the dependencies listed above.
+
+Running the test cases
+======================
+Extensive unittests and test cases are included under the *tests* folder.
+
+To build the tests, you will need the `scons`__ build system. The tests should
+be runnable on most platforms. Windows and Linux builds are regularly tested.
+
+__ http://www.scons.org/