add PREFIX variable
diff --git a/Makefile b/Makefile
index 092a4d4..9b340f0 100644
--- a/Makefile
+++ b/Makefile
@@ -14,12 +14,13 @@
KERNEL_DIR=/usr/src/linux
endif
NETFILTER_VERSION:=1.2.6
-OLD_NETFILTER_VERSION:=1.2.6
+OLD_NETFILTER_VERSION:=1.2.5
-LIBDIR:=/usr/local/lib
-BINDIR:=/usr/local/sbin
-MANDIR:=/usr/local/man
-INCDIR:=/usr/local/include
+PREFIX:=/usr/local
+LIBDIR:=$(PREFIX)/lib
+BINDIR:=$(PREFIX)/sbin
+MANDIR:=$(PREFIX)/man
+INCDIR:=$(PREFIX)/include
# directory for new iptables releases
RELEASE_DIR:=/tmp