6091 avl_add doesn't assert on non-debug builds
Reviewed by: Andy Stormont <astormont@racktopsystems.com>

@@ -37,10 +37,11 @@
 
 $(LINTLIB) :=   SRCS = $(SRCDIR)/$(LINTSRC)
 
 COMDIR =        $(SRC)/common/avl
 
+LDLIBS +=       -lc
 CFLAGS +=       $(CCVERBOSE)
 
 .KEEP_STATE:
 
 all : $(LIBS)