use macro for /usr/local/plan9
diff --git a/man/man3/quote.3 b/man/man3/quote.3
index 5a4c8d1..7e547c0 100644
--- a/man/man3/quote.3
+++ b/man/man3/quote.3
@@ -157,9 +157,9 @@
 .IR print (3)
 format strings.
 .SH SOURCE
-.B /usr/local/plan9/src/lib9/quote.c
+.B \*9/src/lib9/quote.c
 .br
-.B /usr/local/plan9/src/lib9/fmt/fmtquote.c
+.B \*9/src/lib9/fmt/fmtquote.c
 .SH "SEE ALSO
 .IR rc (1),
 .IR malloc (3),