./configure: line 2874: test: too many arguments
--- configure.orig	2016-04-20 00:46:55.000000000 -0500
+++ configure	2016-05-07 21:38:05.000000000 -0500
@@ -2871,7 +2871,7 @@
 ac_config_headers="$ac_config_headers src/config.h"
 
 
-if test -z $CFLAGS; then
+if test -z "$CFLAGS"; then
     CFLAGS='-O3'
 fi