From the webpage:
The Kernel-Machine Library is a free (released under the LGPL) C++ library to promote the use of and progress of kernel machines. It is intended for use in research as well as in practice. The library is known to work with a recent C++ compiler on GNU/Linux, on Mac OS, and on several flavours of Windows.
Below, we would like to give you the choice to either install, use, or improve the library.
The documentation seems a bit slim but perhaps this is an area where contributions would be welcome.