Docs: add crossref

[exim.git] / src / OS / unsupported / Makefile-DragonFly

diff --git a/src/OS/unsupported/Makefile-DragonFly b/src/OS/unsupported/Makefile-DragonFly
index c49c59ffc9e51100a6317f879cc66ae10c3c9287..9d845f13faace90735e7324170da9554f6ad7af8 100644 (file)
--- a/src/OS/unsupported/Makefile-DragonFly
+++ b/src/OS/unsupported/Makefile-DragonFly
@@ -1,4 +1,6 @@
 # Exim: OS-specific make file for DragonFly
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
 # There's no setting of CFLAGS here, to allow the system default
 # for "make" to be the default.