Ghostscript is the real workhorse behind PlainDoc. Many image conversions of pd2tex rely heavily on Ghostscript and it is used by visualization software like gv, GSview, gpdf, and xpdf, so life without Ghostscript is nearly impossible. Good news is that pd2tex is not very sensitive to the version of Ghostscript and most gs(1) binaries in the mainstream Linux distributions work fine. Ghostrcipt web site: www.ghostscript.com