Index: sysutils/qjail/Makefile
===================================================================
--- sysutils/qjail/Makefile	(revision 553935)
+++ sysutils/qjail/Makefile	(working copy)
@@ -24,6 +24,9 @@
 NO_BUILD=	yes
 NO_ARCH=	yes
 
+CONFLICTS=	qjail54-*
+IGNORE_FreeBSD_11=	Requires FreeBSD 12 or later
+
 do-install:
 	${INSTALL_SCRIPT} ${WRKSRC}/qjail                      \
 		${STAGEDIR}${PREFIX}/bin
Index: sysutils/qjail54/Makefile
===================================================================
--- sysutils/qjail54/Makefile	(revision 553935)
+++ sysutils/qjail54/Makefile	(working copy)
@@ -25,6 +25,8 @@
 NO_BUILD=	yes
 NO_ARCH=	yes
 
+CONFLICTS=	qjail-*
+
 do-install:
 	${INSTALL_SCRIPT} ${WRKSRC}/qjail                      \
 		${STAGEDIR}${PREFIX}/bin