diff --git a/src/clean.bash b/src/clean.bash
index 143eb0b7a6..1beb6a5133 100755
--- a/src/clean.bash
+++ b/src/clean.bash
@@ -3,6 +3,7 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
+rm -f $GOROOT/pkg/*.[6a]
 for i in lib9 libbio libmach_amd64 libregexp cmd runtime lib
 do
 	cd $i
diff --git a/src/lib/Makefile b/src/lib/Makefile
index 1fea380681..bd65bf0db2 100644
--- a/src/lib/Makefile
+++ b/src/lib/Makefile
@@ -9,6 +9,7 @@ GC=6g
 DIRS=\
 	container/array\
 	fmt\
+	hash\
 	http\
 	math\
 	net\
@@ -86,6 +87,7 @@ io.6: os.dirinstall syscall.dirinstall
 testing.6: flag.install fmt.dirinstall
 
 fmt.dirinstall: io.install reflect.dirinstall strconv.dirinstall
+hash.dirinstall: os.dirinstall
 http.dirinstall: bufio.install io.install net.dirinstall os.dirinstall strings.install
 net.dirinstall: once.install os.dirinstall strconv.dirinstall
 os.dirinstall: syscall.dirinstall