--- open-iscsi-2.0-872.orig/utils/open-isns/configure.ac
+++ open-iscsi-2.0-872/utils/open-isns/configure.ac
@@ -79,7 +79,7 @@ AC_ARG_WITH(slp,
 			WITH_SLP=$withval
 		else
 			WITH_SLP=yes
-			CPPFLAGS="$CPPFLAGS -I${withval}"
+			CPPFLAGS="$CPPFLAGS -I${withval} -lslp"
 			LDFLAGS="$LDFLAGS -L${withval}"
 		fi
 	]