Building SBA

To build SBA 1.6, I had to pass "-u MAIN__" to the linker. See here:

http://www.ics.forth.gr/~lourakis/sba/faq.html#Q11

To do this, I ran cmake-gui (overwriting the easy-to-read makefile that comes with the source). I found the linker flags options in the "advanced view" and set them to "-u MAIN__". The generated makefile worked.