use macro for /usr/local/plan9
diff --git a/man/man1/dial.1 b/man/man1/dial.1
index 9d55888..7fc50bc 100644
--- a/man/man1/dial.1
+++ b/man/man1/dial.1
@@ -25,6 +25,6 @@
 .I dial
 to exit only in response to end of file on the network connection.
 .SH SOURCE
-.B /usr/local/plan9/src/cmd/dial.c
+.B \*9/src/cmd/dial.c
 .SH SEE ALSO
 .IR dial (3)