SPDX-FileCopyrightText: 2021 Samuel Tyler <samuel@samuelt.me>

SPDX-License-Identifier: GPL-2.0-or-later

This should be declared for gnulib, but for some reason is not, most likely
use of a different version (but CVS history no longer exists).

--- bison-2.3/lib/Makefile.am	2021-04-11 13:49:09.414805465 +1000
+++ bison-2.3/lib/Makefile.am	2021-04-11 13:49:26.418916036 +1000
@@ -19,6 +19,7 @@
 
 BUILT_SOURCES =
 EXTRA_DIST =
+EXTRA_lib_SOURCES =
 MOSTLYCLEANFILES =
 
 lib_LIBRARIES = $(YACC_LIBRARY)
