Kaifeng,

there was an issue where the MacBuilder was using inadvertently big-sur CRAN 
binaries instead of sonoma so the packages were outdated. This has been fixed 
so should ok now (thanks to Ivan earlier helping to chase the issue).

Cheers,
Simon



> On Feb 7, 2026, at 05:58, Kaifeng Lu <[email protected]> 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 <[email protected]> wrote:
> 
>> В Fri, 6 Feb 2026 10:23:27 -0500
>> Kaifeng Lu <[email protected]> пишет:
>> 
>>> 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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> 
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