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https://issues.apache.org/jira/browse/ARROW-11152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17260081#comment-17260081
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Ian Cook commented on ARROW-11152:
----------------------------------
Possibly related: In ARROW-5679, the {{numpy}} line in
{{python/requirements-build.txt}} was changed from
{{numpy>=1.14,<1.19; python_version < "3.6"}}
to
{{numpy>=1.14; python_version >= "3.6"}}
> [CI][C++] Fix Homebrew numpy installation on macOS builds
> ---------------------------------------------------------
>
> Key: ARROW-11152
> URL: https://issues.apache.org/jira/browse/ARROW-11152
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++, Continuous Integration
> Reporter: Neal Richardson
> Assignee: Neal Richardson
> Priority: Blocker
> Fix For: 3.0.0
>
>
> Numpy fails to install with homebrew because it tries to upgrade gcc and hits
> a {{brew link}} error. Running {{brew unlink gcc@8 gcc@9}} before {{brew
> install}} could work around this.
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