Hello. It seems that there are two broken links in section 2.2.1. of fdp-primer: https://www.freebsd.org/doc/en_US.ISO8859-1/books/fdp-primer/tools-optional.html print/jadetex and print/teTeX lead to 'An Exception Has Occurred'. I think these are outdated because teTeX is unmaintained now. Please check this out. Thank you :)