Using older AT&T +Berkeley with groff-1.18.1 on Linux systems

Steps

• Copy the vendor /usr/share/lib/tmac files from a solaris machine to your target host under /usr/share/lib/tmac
• Copy /software/groff-1.18.1/lib/groff/site-tmac to /usr/local/site-tmac.old

GROFF_TMAC_PATH
    A  list of directories in which to search for macro files in ad-
    dition  to  the   default   directories.    See   troff(1)   and
    groff_tmac(5) for more details.

I ran tests using the -M option as follows
groff -M /usr/local/site-tmac.old ...