See:
	https://www.varnish-cache.org/trac/ticket/1202

--- bin/varnishtest/vtc_log.c	2012-08-20 05:20:40.000000000 -0400
+++ bin/varnishtest/vtc_log.c	2012-10-01 12:35:45.000000000 -0400
@@ -138,5 +138,5 @@
 	AZ(pthread_mutex_lock(&vl->mtx));
 	vl->act = 1;
-	assert(lvl < NLEAD);
+	assert(lvl < (int)NLEAD);
 	VSB_clear(vl->vsb);
 	VSB_printf(vl->vsb, "%s %-4s %4.1f ",