extlibs.rb: make symlink only if the target exists
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@ -99,6 +99,7 @@ class ExtLibs
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if (target = src).start_with?("/")
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target = File.join([".."] * file.count("/"), src)
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end
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return unless File.exist?(File.expand_path(target, File.dirname(file)))
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File.unlink(file) rescue nil
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begin
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File.symlink(target, file)
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