diff --git a/external/gpl2/xcvs/dist/src/Makefile.am b/external/gpl2/xcvs/dist/src/Makefile.am
index 160fa2dcd655..655fd5a88383 100644
--- a/external/gpl2/xcvs/dist/src/Makefile.am
+++ b/external/gpl2/xcvs/dist/src/Makefile.am
@@ -26,6 +26,7 @@ bin_SCRIPTS = cvsbug
 
 # The cvs executable
 cvs_SOURCES = \
+	acl.c \
 	add.c \
 	admin.c \
 	annotate.c \