软件包匿名 FTP 来源（也可参见这些站点的镜像和 CD-ROM）
dvips ftp.shsu.edu/tex-archive/dviware/dvips/
groff prep.ai.mit.edu/pub/gnu/
ghostscript prep.ai.mit.edu/pub/gnu/
netpbm tsx-11.mit.edu /pub/linux/binaries/usr.bin/
nenscript sunsite.unc.edu/pub/Linux/system/printing/
magicfilter sunsite.unc.edu/pub/Linux/system/printing/