diff --git a/.gitignore b/.gitignore
index d06ff30..5f7fc76 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
-/catclock
+/o.catclock
 /catclock.o
 *~
diff --git a/mkfile b/mkfile
index 21ae92f..85723df 100644
--- a/mkfile
+++ b/mkfile
@@ -1,14 +1,6 @@
-catclock: catclock.o
-	9l -o catclock catclock.o
+<$PLAN9/src/mkhdr
 
-catclock.o: catclock.c
-	9c catclock.c
+TARG = catclock
+OFILES = $TARG.$O
 
-install: catclock
-	install catclock /usr/local/plan9/bin/catclock
-
-uninstall:
-	[ ! -e /usr/local/plan9/bin/catclock ] || rm /usr/local/plan9/bin/catclock
-
-clean:
-	rm -f catclock catclock.o
+<$PLAN9/src/mkone