[R-pkg-devel] macOS build error 'R_ext/Callbacks.h' file not found

On Feb 7, 2026, at 05:58, Kaifeng Lu <kaifenglu at gmail.com> wrote:

Hi Martin and Ivan,

Thank you both for the clarification.

I have confirmed that I am using the most recent versions for my
environment: R 4.5.2, Rcpp 1.1.1, RcppParallel 5.1.11-1, and RcppThread
2.3.0. Based on our discussion, I will wait for the macOS Builder updates
to conclude before re-checking the build results.

Does anyone have an estimate on when the current CRAN macOS builder updates
are expected to complete?

Thank you again for your guidance.

Best regards,
Kaifeng


On Fri, Feb 6, 2026 at 11:07?AM Ivan Krylov <ikrylov at disroot.org> wrote:

? Fri, 6 Feb 2026 10:23:27 -0500
Kaifeng Lu <kaifenglu at gmail.com> ?????:

I am currently submitting a new version of the trtswitch package to
CRAN and have encountered a fatal error during the macOS arm64 build
process: fatal error: 'R_ext/Callbacks.h' file not found
The full build log for this submission is available here
macOS build result for 1770388945-93cbe1227ad944fa
<

https://mac.r-project.org/macbuilder/results/1770388945-93cbe1227ad944fa/>

In file included from
.../Rcpp/include/Rcpp.h:27: ...Rcpp/include/RcppCommon.h:75:10:
fatal error: 'R_ext/Callbacks.h' file not found

This was fixed in Rcpp in December 2025 [1] and should work well with
the latest version of Rcpp. The macOS Builder seems to be behind on
some package updates right now.

--
Best regards,
Ivan

[1] https://github.com/RcppCore/Rcpp/pull/1418

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