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+########################################################
+# Copyright 2018 ARM Limited. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification,
+# are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+# this list of conditions and the following disclaimer.
+#
+# 2. 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.
+#
+# 3. Neither the name of the copyright holder 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 HOLDER 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.
+#
+#################################################################################
+
+## Set up some addtional parameters for development environment builds. ##
+
+## define arch/build sub-dirs for non installed dev builds
+ifndef ARCH
+ARCH := $(shell dpkg-architecture -q DEB_HOST_GNU_CPU || echo not)
+endif
+
+# platform bit size variant
+ifeq ($(ARCH),x86)
+ MFLAG:="-m32"
+ BIT_VARIANT=32
+else ifeq ($(ARCH),x86_64)
+ MFLAG:="-m64"
+ BIT_VARIANT=64
+else ifeq ($(ARCH),arm)
+ BIT_VARIANT=-arm
+else ifeq ($(ARCH),arm64)
+ BIT_VARIANT=-arm64
+else ifeq ($(ARCH),aarch64)
+ BIT_VARIANT=-arm64
+else ifeq ($(ARCH),aarch32)
+ BIT_VARIANT=-arm
+endif
+
+CXXFLAGS += $(MFLAG)
+CFLAGS += $(MFLAG)
+LDFLAGS += $(MFLAG)
+
+ifdef GCCDIR
+GCCVER:= $(shell $(CROSS_COMPILE)gcc -dumpversion | cut -c 1-3)
+PLAT_DIR=builddir/linux$(BIT_VARIANT)/GCC_$(GCCVER)
+else
+PLAT_DIR=linux$(BIT_VARIANT)/$(BUILD_VARIANT)
+endif
+
+# for dev env, enable static link build test
+export TEST_STATIC_LINKING=1
+
+# include the main makefile
+include makefile