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from dulwich import __version__ as dulwich_version
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raise bzr_errors.DependencyNotPresent("dulwich", "bzr-git: Please install dulwich, https://launchpad.net/dulwich")
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if dulwich_version < dulwich_minimum_version:
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raise bzr_errors.DependencyNotPresent("dulwich", "bzr-git: Dulwich is too old; at least %d.%d.%d is required" % dulwich_minimum_version)