build system: Add missing copyright notice to Makefile

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/Makefile b/Makefile
index a067dcbc8e617a8f16cebb299a81fd84ac5110cd..603b24ea623f859d99633ca19af3bebd9285f122 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,8 @@
 
+# Copyright 2016,2020 Ian Jackson
+# SPDX-License-Identifier: GPL-3.0-or-later
+# There is NO WARRANTY.
+
 INSTALL ?= install
 INSTALL_SCRIPT ?= $(INSTALL) -m 755