Andreas,

This looks like an error:

    > reassign 1037439 src:r-base
    Bug #1037439 {Done: Dirk Eddelbuettel <e...@debian.org>} [r-cran-rstan] 
r-cran-rstan/armhf FTBFS with r-cran-bh 1.74, works with boost 1.81
    Bug reassigned from package 'r-cran-rstan' to 'src:r-base'.
    No longer marked as found in versions r-cran-rstan/2.21.8-1 and r-cran-bh.

r-base-core cannot possibly be the cause.  What we have here is that

    - R packages can use (C++ upstream library) Boost (from boost.org)
    - (ie not be confused with a CRAN package called boost)
    - I happen to be upstream for CRAN package BH
    - Which I update annually in December, so CRAN is now at 1.81
    - Because BH is big we once decided to _not_ double it up in Debian
    - So we have r-cran-bh essentially as a virtual package depending on 
libboost-all-dev

In June, we put a hard version constraint into r-cran-bh to enfore 1.81 or
later:

    r-cran-bh (1.81.0-1) unstable; urgency=medium
    
      * debian/control: Update Build-Depends to libboost1.81-dev to ensure use
        of Boost 1.81 (needed eg by rstan) which is not yet the default Boost
        in Debian, but available. Note to re-set this to libboost-dev once it
        is default. Thanks to Steve Langasek for the idea. (Closes: #1037439)
    
      * debian/control: Set Build-Depends: to current R version
      * debian/control: Set Standards-Version: to current version 
      * debian/control: Switch to virtual debhelper-compat (= 12)

     -- Dirk Eddelbuettel <e...@debian.org>  Tue, 13 Jun 2023 07:10:09 -0500

Steve may have suggsted that at the time for Ubuntu build issues. So is this
now in Debian unstable/testing? IIRC there was a migration.

Thanks for any pointer,  Dirk

-- 
dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org

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