diff --git a/src/os/file.go b/src/os/file.go
index 99977fa4..a7aa4043 100644
--- a/src/os/file.go
+++ b/src/os/file.go
@@ -116,6 +116,11 @@ func (f *File) Readdirnames(n int) (names []string, err error) {
 	return nil, &PathError{"readdirnames", f.name, ErrNotImplemented}
 }
 
+// Seek is a stub, not yet implemented
+func (f *File) Seek(offset int64, whence int) (ret int64, err error) {
+	return 0, &PathError{"seek", f.name, ErrNotImplemented}
+}
+
 // Stat is a stub, not yet implemented
 func (f *File) Stat() (FileInfo, error) {
 	return nil, &PathError{"stat", f.name, ErrNotImplemented}
diff --git a/src/os/tempfile.go b/src/os/tempfile.go
new file mode 100644
index 00000000..27949f7f
--- /dev/null
+++ b/src/os/tempfile.go
@@ -0,0 +1,5 @@
+package os
+
+func CreateTemp(dir, pattern string) (*File, error) {
+	return nil, &PathError{"createtemp", pattern, ErrNotImplemented}
+}