open(MACRO, "/usr/lib/groff/tmac/tmac.an") ||
open(MACRO, "/usr/lib/groff/tmac/an.tmac") ||
open(MACRO, "/usr/share/tmac/tmac.an") ||
+ open(MACRO, "/usr/share/tmac/an.tmac") ||
open(MACRO, "/usr/share/groff/tmac/tmac.an") ||
open(MACRO, "/usr/share/groff/tmac/an.tmac") ||
open(MACRO, "/usr/share/groff/$groffver/tmac/an.tmac") )