Index: sysutils/lsof/Makefile
===================================================================
--- sysutils/lsof/Makefile
+++ sysutils/lsof/Makefile
@@ -52,7 +52,7 @@
 .endif
 
 .if !exists(${SRC_BASE}/sys/kern/kern_lockf.c)
-IGNORE+=	requires kernel sources
+IGNORE+=	requires kernel sources (or set SRC_BASE)
 .endif
 
 do-install: