You need to install libsis.a.
I'm not sure what libsis is, it certainly isn't a standard Debian package. it could be a “logic synthesis system” from UC Berkeley (
http://embedded.eecs.berkeley.edu/Alumni/pchong/sis/). This has probably been removed due to a lack of support, since it's authors don't support it anymore. But you should be able to install it from the tarball at that link.
Hope that helps,
— Robert J Lee