./pl-6.4.1.tar.gz already exists, skipping download
./SWI-Prolog-6.4.1.pdf already exists, skipping download
./userguide.html.tgz already exists, skipping download
Getting http://www.swi-prolog.org/download/stable/src/pl-6.4.1.tar.gz to ./pl-6.4.1.tar.gz
Getting http://www.swi-prolog.org/download/stable/doc/SWI-Prolog-6.4.1.pdf to ./SWI-Prolog-6.4.1.pdf
Getting http://www.swi-prolog.org/download/xpce/doc/userguide/userguide.html.tgz to ./userguide.html.tgz