--- kbd-2.0.4.ebuild.a	2018-07-20 09:44:20.074142400 +0000
+++ kbd-2.0.4.ebuild.b	2018-07-20 09:44:28.194192714 +0000
@@ -53,7 +53,7 @@
 src_configure() {
 	econf \
 		$(use_enable nls) \
-		$(use_enable pam vlock) \
+		$(usex pam '' '--disable-vlock') \
 		$(use_enable test tests)
 }