use macro for /usr/local/plan9
diff --git a/man/man3/get9root.3 b/man/man3/get9root.3
index 134f305..9c9ed26 100644
--- a/man/man3/get9root.3
+++ b/man/man3/get9root.3
@@ -13,7 +13,7 @@
char* unsharp(char *path)
.SH DESCRIPTION
This tree of Plan 9 software is conventionally installed in
-.B /usr/local/plan9
+.B \*9
but may be installed in other places (for example, users without
the ability to write to
.B /usr/local
@@ -25,7 +25,7 @@
returns a static pointer to the pathname of root, first checking
.B $PLAN9
and defaulting to
-.BR /usr/local/plan9 .
+.BR \*9 .
.PP
The lack of a fixed location for the Plan 9 tree
makes it difficult to hard-code paths
@@ -65,7 +65,7 @@
fd = open(unsharp(buf), OREAD);
.EE
.SH SOURCE
-.B /usr/local/plan9/src/lib9/getns.c
+.B \*9/src/lib9/getns.c
.SH SEE ALSO
.IR intro (4)
.SH BUGS
