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+# Set some important global variables if they haven't already been set by the
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+# user on the command-line or in the environment
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+
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+# Establish this as the root of the boost installation. Most targets will want
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+# $(BOOST_ROOT) in their #include path. $(gTOP) is the name of the variable
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+# containing the path from the invocation directory to the project root.
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+BOOST_ROOT ?= $($(gTOP)) ;
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+
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+# These variables tell the build system where to find the rest of the build
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+# system installation (e.g. toolset descriptions, variants)
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+BOOST_BUILD_INSTALLATION ?= $(TOP)$(SLASH)tools$(SLASH)build ;
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+BOOST_BASE_DIR ?= $(BOOST_BUILD_INSTALLATION) ;
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+
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+# This variable will surely need to be set specific to your installation, though
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+# we may be able to provide better defaults for some systems. It is used by the
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+# toolset(s) that use STLport
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+STLPORT_ROOT ?= c:/downloads/STLPort-0601 ;
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+
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