C++ compilation error on CRAN r-devel-windows check
09:36 16 Dec 2025

The newest version of the backbone package (v3.0.3) on CRAN is generating this error during the automated checks on r-devel-windows-x86_64:

using C++ compiler: 'g++.exe (GCC) 14.3.0'
make[1]: Entering directory '/d/temp/2025_12_11_01_50_00_29123/Rtmp0S4wJB/R.INSTALL3e5c542f717b/backbone/src'
g++ -std=gnu++17  -I"D:/RCompile/recent/R/include" -DNDEBUG  -I'D:/RCompile/CRANpkg/lib/4.6/Rcpp/include'   -I"d:/rtools45/x86_64-w64-mingw32.static.posix/include"      -pedantic -O2 -Wall  -mfpmath=sse -msse2 -mstackrealign    -c RcppExports.cpp -o RcppExports.o
In file included from D:/RCompile/CRANpkg/lib/4.6/Rcpp/include/Rcpp.h:84,
                 from RcppExports.cpp:4:
D:/RCompile/CRANpkg/lib/4.6/Rcpp/include/Rcpp/Rmath.h: In function 'double R::rnbeta(double, double, double)':
D:/RCompile/CRANpkg/lib/4.6/Rcpp/include/Rcpp/Rmath.h:163:100: error: '::Rf_rnbeta' has not been declared; did you mean 'Rf_rbeta'?
  163 |     inline double rnbeta(double a, double b, double np)                                 { return ::Rf_rnbeta(a, b, np); }
      |                                                                                                    ^~~~~~~~~
      |                                                                                                    Rf_rbeta
make[1]: *** [D:/RCompile/recent/R/etc/x64/Makeconf:296: RcppExports.o] Error 1
make[1]: Leaving directory '/d/temp/2025_12_11_01_50_00_29123/Rtmp0S4wJB/R.INSTALL3e5c542f717b/backbone/src'
ERROR: compilation failed for package 'backbone'

I have been unable to replicate the error on a windows platform using rhub, and the error does not occur during automated CRAN checks on any other platform (including r-release-windows-x86_64 and r-oldrel-windows-x86_64). Could this be a problem with the C++ compiler in CRAN's r-devel-windows installation? Any insight or suggestions are appreciated.

c++ cran