and are not needed to compile, install or use libosl. In order to
make these targets the following additional tools are needed:
-- [doxygen](http://www.stack.nl/~dimitri/doxygen/)
- [discount](http://www.pell.portland.or.us/~orc/Code/discount/)
- [ImageMagick](http://www.imagemagick.org/script/index.php)