heirloom-doctools (classic implementation of the troff tools) The Heirloom Documentation Tools package provides troff, nroff, and related utilities to format manual pages and other documents for output on terminals and printers. They are portable and enhanced versions of the utilities released by Sun as part of OpenSolaris, which are a variant of ditroff, which, in turn, descends to the historical Unix troff that generated output for the C/A/T phototypesetter. Path settings: The files get installed into /opt/heirloom . The included /etc/profile.d/heirloom.sh script sets the PATH to include this directory _in front of_ the usual paths, so that troff points to the heirloom version, not the gnu version. To enable this behaviour, make the /etc/profile.d/heirloom.sh script executable.