ftp://ftp.saintjoe.edu/pub/linux/slackware/slackware-current/source/xap/gnuplot/  direct

1.08 KB  2001-03-16slack-desc  2084+ mirrors
2.21 MB  2007-03-10gnuplot-4.2.3.tar.bz2  238+ mirrors
3.28 KB  2009-05-08gnuplot.SlackBuild  14 mirrors