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+#
+# Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+#
+# This code is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License version 2 only, as
+# published by the Free Software Foundation. Oracle designates this
+# particular file as subject to the "Classpath" exception as provided
+# by Oracle in the LICENSE file that accompanied this code.
+#
+# This code is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+# version 2 for more details (a copy is included in the LICENSE file that
+# accompanied this code).
+#
+# You should have received a copy of the GNU General Public License version
+# 2 along with this work; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+# or visit www.oracle.com if you need additional information or have any
+# questions.
+#
+
+###
+### This file is just a very small wrapper needed to run the real make/Init.gmk.
+### It also performs some sanity checks on make.
+###
+
+# The shell code below will be executed on /usr/ccs/bin/make on Solaris, but not in GNU Make.
+# /usr/ccs/bin/make lacks basically every other flow control mechanism.
+.TEST_FOR_NON_GNUMAKE:sh=echo You are not using GNU Make/gmake, this is a requirement. Check your path. 1>&2 && exit 1
+
+# The .FEATURES variable is likely to be unique for GNU Make.
+ifeq ($(.FEATURES), )
+ $(info Error: '$(MAKE)' does not seem to be GNU Make, which is a requirement.)
+ $(info Check your path, or upgrade to GNU Make 3.81 or newer.)
+ $(error Cannot continue)
+endif
+
+# Assume we have GNU Make, but check version.
+ifeq ($(strip $(foreach v, 3.81% 3.82% 4.%, $(filter $v, $(MAKE_VERSION)))), )
+ $(info Error: This version of GNU Make is too low ($(MAKE_VERSION)).)
+ $(info Check your path, or upgrade to GNU Make 3.81 or newer.)
+ $(error Cannot continue)
+endif
+
+# In Cygwin, the MAKE variable gets prepended with the current directory if the
+# make executable is called using a Windows mixed path (c:/cygwin/bin/make.exe).
+ifneq ($(findstring :, $(MAKE)), )
+ MAKE := $(patsubst $(CURDIR)%, %, $(patsubst $(CURDIR)/%, %, $(MAKE)))
+endif
+
+# Locate this Makefile
+ifeq ($(filter /%, $(lastword $(MAKEFILE_LIST))),)
+ makefile_path := $(CURDIR)/$(strip $(lastword $(MAKEFILE_LIST)))
+else
+ makefile_path := $(lastword $(MAKEFILE_LIST))
+endif
+topdir := $(strip $(patsubst %/, %, $(dir $(makefile_path))))
+
+# ... and then we can include the real makefile
+include $(topdir)/make/Init.gmk