--- ./Makefile.orig	2012-08-21 19:24:15.000000000 +0200
+++ ./Makefile	2014-04-17 15:33:06.454854016 +0200
@@ -5,7 +5,7 @@
 # http://miniupnp.free.fr/libnatpmp.html
 
 OS = $(shell uname -s)
-CC = gcc
+CC ?= gcc
 INSTALL = install
 
 # APIVERSION is used in soname
@@ -61,14 +61,14 @@
 	makedepend -f$(MAKEFILE_LIST) -Y $(OBJS:.o=.c) 2>/dev/null
 
 install:	$(HEADERS) $(STATICLIB) $(SHAREDLIB) natpmpc-shared
-	$(INSTALL) -d $(INSTALLDIRINC)
-	$(INSTALL) -m 644 $(HEADERS) $(INSTALLDIRINC)
-	$(INSTALL) -d $(INSTALLDIRLIB)
-	$(INSTALL) -m 644 $(STATICLIB) $(INSTALLDIRLIB)
-	$(INSTALL) -m 644 $(SHAREDLIB) $(INSTALLDIRLIB)/$(SONAME)
-	$(INSTALL) -d $(INSTALLDIRBIN)
-	$(INSTALL) -m 755 natpmpc-shared $(INSTALLDIRBIN)/natpmpc
-	ln -s -f $(SONAME) $(INSTALLDIRLIB)/$(SHAREDLIB)
+	$(INSTALL) -d $(DESTDIR)$(INSTALLDIRINC)
+	$(INSTALL) -m 644 $(HEADERS) $(DESTDIR)$(INSTALLDIRINC)
+	$(INSTALL) -d $(DESTDIR)$(INSTALLDIRLIB)
+	$(INSTALL) -m 644 $(STATICLIB) $(DESTDIR)$(INSTALLDIRLIB)
+	$(INSTALL) -m 644 $(SHAREDLIB) $(DESTDIR)$(INSTALLDIRLIB)/$(SONAME)
+	$(INSTALL) -d $(DESTDIR)$(INSTALLDIRBIN)
+	$(INSTALL) -m 755 natpmpc-shared $(DESTDIR)$(INSTALLDIRBIN)/natpmpc
+	ln -s -f $(SONAME) $(DESTDIR)$(INSTALLDIRLIB)/$(SHAREDLIB)
 
 cleaninstall:
 	$(RM) $(addprefix $(INSTALLDIRINC), $(HEADERS))