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+# BSD LICENSE
+#
+# Copyright(c) 2010-2012 Intel Corporation. All rights reserved.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in
+# the documentation and/or other materials provided with the
+# distribution.
+# * Neither the name of Intel Corporation nor the names of its
+# contributors may be used to endorse or promote products derived
+# from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# version: DPDK.L.1.2.3-3
+
+#
+# To be included at the beginning of all RTE user Makefiles. This
+# .mk will define the RTE environment variables by including the
+# config file of SDK. It also includes the config file from external
+# application if any.
+#
+
+ifeq ($(RTE_SDK),)
+$(error RTE_SDK is not defined)
+endif
+ifeq ($(wildcard $(RTE_SDK)),)
+$(error RTE_SDK variable points to an invalid location)
+endif
+
+# define Q to '@' or not. $(Q) is used to prefix all shell commands to
+# be executed silently.
+Q=@
+ifdef V
+ifeq ("$(origin V)", "command line")
+Q=
+endif
+endif
+export Q
+
+# if we are building SDK, only includes SDK configuration
+ifneq ($(BUILDING_RTE_SDK),)
+ include $(RTE_OUTPUT)/.config
+ # remove double-quotes from config names
+ RTE_ARCH := $(CONFIG_RTE_ARCH:"%"=%)
+ RTE_MACHINE := $(CONFIG_RTE_MACHINE:"%"=%)
+ RTE_EXEC_ENV := $(CONFIG_RTE_EXEC_ENV:"%"=%)
+ RTE_TOOLCHAIN := $(CONFIG_RTE_TOOLCHAIN:"%"=%)
+ RTE_TARGET := $(RTE_ARCH)-$(RTE_MACHINE)-$(RTE_EXEC_ENV)-$(RTE_TOOLCHAIN)
+ RTE_SDK_BIN := $(RTE_OUTPUT)
+endif
+
+# RTE_TARGET is deducted from config when we are building the SDK.
+# Else, when building an external app, RTE_TARGET must be specified
+# by the user.
+ifeq ($(RTE_TARGET),)
+$(error RTE_TARGET is not defined)
+endif
+
+ifeq ($(BUILDING_RTE_SDK),)
+# if we are building an external app/lib, include rte.extvars.mk that will
+# define RTE_OUTPUT, RTE_SRCDIR, RTE_EXTMK, RTE_SDK_BIN, (etc ...)
+include $(RTE_SDK)/mk/rte.extvars.mk
+endif
+
+ifeq ($(RTE_ARCH),)
+$(error RTE_ARCH is not defined)
+endif
+
+ifeq ($(RTE_MACHINE),)
+$(error RTE_MACHINE is not defined)
+endif
+
+ifeq ($(RTE_EXEC_ENV),)
+$(error RTE_EXEC_ENV is not defined)
+endif
+
+ifeq ($(RTE_TOOLCHAIN),)
+$(error RTE_TOOLCHAIN is not defined)
+endif
+
+# can be overriden by make command line or exported environment variable
+RTE_KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+
+export RTE_TARGET
+export RTE_ARCH
+export RTE_MACHINE
+export RTE_EXEC_ENV
+export RTE_TOOLCHAIN
+
+# SRCDIR is the current source directory
+ifdef S
+SRCDIR := $(abspath $(RTE_SRCDIR)/$(S))
+else
+SRCDIR := $(RTE_SRCDIR)
+endif
+
+# helper: return y if option is set to y, else return an empty string
+testopt = $(if $(strip $(subst y,,$(1)) $(subst $(1),,y)),,y)
+
+# helper: return an empty string if option is set, else return y
+not = $(if $(strip $(subst y,,$(1)) $(subst $(1),,y)),,y)
+
+ifneq ($(wildcard $(RTE_SDK)/mk/target/$(RTE_TARGET)/rte.vars.mk),)
+include $(RTE_SDK)/mk/target/$(RTE_TARGET)/rte.vars.mk
+else
+include $(RTE_SDK)/mk/target/generic/rte.vars.mk
+endif