xcode_requirement: handle nil @version.
When the Xcode requirement doesn't specify a version then we need to guard this check.
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@ -22,7 +22,7 @@ class XcodeRequirement < Requirement
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A full installation of Xcode.app#{version} is required to compile this software.
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A full installation of Xcode.app#{version} is required to compile this software.
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Installing just the Command Line Tools is not sufficient.
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Installing just the Command Line Tools is not sufficient.
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EOS
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EOS
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if Version.new(MacOS::Xcode.latest_version) < Version.new(@version)
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if @version && Version.new(MacOS::Xcode.latest_version) < Version.new(@version)
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message + <<~EOS
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message + <<~EOS
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Xcode#{version} cannot be installed on macOS #{MacOS.version}.
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Xcode#{version} cannot be installed on macOS #{MacOS.version}.
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You must upgrade your version of macOS.
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You must upgrade your version of macOS.
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