Add some missing files.
diff --git a/src/lib9/opentemp.c b/src/lib9/opentemp.c
new file mode 100644
index 0000000..ff2b3f8
--- /dev/null
+++ b/src/lib9/opentemp.c
@@ -0,0 +1,9 @@
+#include <u.h>
+#include <libc.h>
+
+int
+opentemp(char *template)
+{
+	return mkstemp(template);
+}
+