Index: head/sbin/dhclient/Makefile
===================================================================
--- head/sbin/dhclient/Makefile
+++ head/sbin/dhclient/Makefile
@@ -44,7 +44,9 @@
 	dhclient-script.8
 LIBADD=	util
 
-.if ${MK_CASPER} != "no" && !defined(RESCUE)
+.if ${MK_DYNAMICROOT} == "no"
+.warning ${PROG} built without libcasper support
+.elif ${MK_CASPER} != "no" && !defined(RESCUE)
 LIBADD+=        casper
 LIBADD+=        cap_syslog
 CFLAGS+=-DWITH_CASPER
Index: head/sbin/ping/Makefile
===================================================================
--- head/sbin/ping/Makefile
+++ head/sbin/ping/Makefile
@@ -11,7 +11,9 @@
 WARNS?=	3
 LIBADD=	m
 
-.if ${MK_CASPER} != "no" && !defined(RESCUE)
+.if ${MK_DYNAMICROOT} == "no"
+.warning ${PROG} built without libcasper support
+.elif ${MK_CASPER} != "no" && !defined(RESCUE)
 LIBADD+=	casper
 LIBADD+=	cap_dns
 CFLAGS+=-DWITH_CASPER