use macro for /usr/local/plan9
diff --git a/man/man3/getfields.3 b/man/man3/getfields.3
index 7805290..feaf10d 100644
--- a/man/man3/getfields.3
+++ b/man/man3/getfields.3
@@ -87,7 +87,7 @@
 .I delims
 set to \f5"\et\er\en "\fP.
 .SH SOURCE
-.B /usr/local/plan9/src/lib9/tokenize.c
+.B \*9/src/lib9/tokenize.c
 .SH SEE ALSO
 .I strtok
 in