[build] ensure we don't fail abruptly in BOOST_LIB_VERSION_FROM_HEADER is unknown
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@ -1597,8 +1597,8 @@ if not preconfigured:
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# around. See https://svn.boost.org/trac/boost/ticket/6779 for more
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# details.
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if not env['HOST']:
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boost_version = [int(x) for x in env.get('BOOST_LIB_VERSION_FROM_HEADER').split('_')]
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if not conf.CheckBoostScopedEnum():
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boost_version = [int(x) for x in env.get('BOOST_LIB_VERSION_FROM_HEADER').split('_') if x]
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if boost_version < [1, 51]:
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env.Append(CXXFLAGS = '-DBOOST_NO_SCOPED_ENUMS')
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elif boost_version < [1, 57]:
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