--- mongrel2-v1.11.0.orig/tools/procer/Makefile	2015-12-31 10:25:18.000000000 +0100
+++ mongrel2-v1.11.0/tools/procer/Makefile	2016-04-25 20:05:39.765826160 +0200
@@ -1,5 +1,6 @@
-CFLAGS=-DNDEBUG -pthread -g -I../../src -Wall $(OPTFLAGS)
-PREFIX?=/usr/local
+CFLAGS?=
+CFLAGS+=-DNDEBUG -pthread -g -I../../src -Wall $(OPTFLAGS)
+PREFIX?=/usr
 LIBS?=-lzmq 
 SOURCES=$(wildcard *.c)
 OBJECTS=$(patsubst %.c,%.o,${SOURCES})