diff -Naur libnatpmp-20110808.1//Makefile libnatpmp-20110808/Makefile
--- libnatpmp-20110808.1//Makefile	2011-06-22 18:28:00.000000000 -0400
+++ libnatpmp-20110808/Makefile	2011-12-17 06:41:21.000000000 -0500
@@ -4,14 +4,17 @@
 # (c) 2007-2011 Thomas Bernard
 # http://miniupnp.free.fr/libnatpmp.html
 
+GENTOO_CFLAGS := $(CFLAGS)
+GENTOO_LDFLAGS := $(LDFLAGS)
+
 OS = $(shell uname -s)
-CC = gcc
+CC ?= gcc
 INSTALL = install
 
 # APIVERSION is used in soname
 APIVERSION = 1
-#LDFLAGS = -Wl,--no-undefined
-CFLAGS = -O -fPIC -Wall -DENABLE_STRNATPMPERR
+LDFLAGS = $(GENTOO_LDFLAGS)
+CFLAGS = -O -fPIC -Wall -DENABLE_STRNATPMPERR $(GENTOO_CFLAGS)
 
 LIBOBJS = natpmp.o getgateway.o