ofp-dpdk: use dpdk 17.11.6 LTS

pkgs/os-specific/linux/odp-dpdk/default.nix

@@ -1,8 +1,16 @@
 { stdenv, fetchurl, autoreconfHook, pkgconfig
 , dpdk, libconfig, libpcap, numactl, openssl
-}:
+}: let
 
-stdenv.mkDerivation rec {
+  dpdk_17_11 = dpdk.overrideAttrs (old: rec {
+    version = "17.11.6";
+    src = fetchurl {
+      url = "https://fast.dpdk.org/rel/dpdk-${version}.tar.xz";
+      sha256 = "0g4l6yjcn17n18c7q1pxkmnj4fg2kiv0krz7n2vjjsb8s6gmbps2";
+    };
+  });
+
+in stdenv.mkDerivation rec {
   pname = "odp-dpdk";
   version = "1.19.0.0_DPDK_17.11";
 
@@ -12,16 +20,16 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ autoreconfHook pkgconfig ];
-  buildInputs = [ dpdk libconfig libpcap numactl openssl ];
+  buildInputs = [ dpdk_17_11 libconfig libpcap numactl openssl ];
 
-  RTE_SDK = "${dpdk}/share/dpdk";
+  RTE_SDK = "${dpdk_17_11}/share/dpdk";
   RTE_TARGET = "x86_64-native-linuxapp-gcc";
 
   dontDisableStatic = true;
 
   configureFlags = [
     "--disable-shared"
-    "--with-dpdk-path=${dpdk}"
+    "--with-dpdk-path=${dpdk_17_11}"
   ];
 
   meta = with stdenv.lib; {