--- nmap-6.40.orig/liblinear/Makefile	2011-09-23 23:15:09.000000000 +0200
+++ nmap-6.40/liblinear/Makefile	2014-02-11 19:38:23.000000000 +0100
@@ -1,10 +1,10 @@
 CXX ?= g++
 CC ?= gcc
-CFLAGS = -Wall -Wconversion -O3 -fPIC
+CFLAGS ?= -Wall -Wconversion -O3 -fPIC
 LIBS = blas/blas.a
 SHVER = 1
-AR = ar
-RANLIB = ranlib
+AR ?= ar
+RANLIB ?= ranlib
 #LIBS = -lblas
 
 all: train predict