brew doctor output

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Verification

• My "brew doctor output" above says Your system is ready to brew. and am still able to reproduce my issue.
• I ran brew update twice and am still able to reproduce my issue.
• This issue's title and/or description do not reference a single formula e.g. brew install wget. If they do, open an issue at https://github.com/Homebrew/homebrew-core/issues/new/choose instead.

brew config output

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What were you trying to do (and why)?

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What happened (include all command output)?

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What did you expect to happen?

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Step-by-step reproduction instructions (by running brew commands)

installing qt from source on my arch linux box ends up using all resources on my computer during the build process, and causes the computer to lock up.