use macro for /usr/local/plan9

man/man1/psfonts.1

@@ -21,7 +21,7 @@ and
 .IR tr2post (1)
 use non-standard PostScript fonts
 (found in
-.BR /usr/local/plan9/postscript/font ).
+.BR \*9/postscript/font ).
 Before sending PostScript output from
 .I tr2post
 to a standard printer, code implementing
@@ -96,7 +96,7 @@ and
 .B -r
 above;
 default
-.BR /usr/local/plan9/postscript/font ).
+.BR \*9/postscript/font ).
 .TP
 .BI -T " tmpdir
 Use
@@ -117,9 +117,9 @@ See
 .IR tr2post (1)
 for an example.
 .SH SOURCE
-.B /usr/local/plan9/bin/psfonts
+.B \*9/bin/psfonts
 .br
-.B /usr/local/plan9/src/cmd/postscript/download
+.B \*9/src/cmd/postscript/download
 .SH SEE ALSO
 .IR troff (1),
 .IR tr2post (1)