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GH-55398: [R][CI] Build the Windows libarrow binary with Rtools45 instead of Rtools40 - #55594

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thisisnic wants to merge 2 commits into
apache:mainfrom
thisisnic:GH-55398-rtools45-ci
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thisisnic wants to merge 2 commits into
apache:mainfrom
thisisnic:GH-55398-rtools45-ci

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@thisisnic

@thisisnic thisisnic commented Nov 13, 2026 •

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Rationale for this change

Upgrading from old toolchain for R Windows builds

What changes are included in this PR?

Bump default RTools version to 4.5 but keep 4.0 on in CI so we can support past few R versions still

Are these changes tested?

On CI, aye

Are there any user-facing changes?

Nope

Was AI used for this PR?

Yeah, absolutely but I'll give it a proper read and trim once the code works

PR code and description written by:

  • Human
  • AI

Reviewed before submission by:

  • Human
  • AI
  • Not reviewed

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⚠️ GitHub issue #55398 has been automatically assigned in GitHub to PR creator.

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