I frequently find that attempts to install R packages that include
C++ code encounter
/Users/.../Library/R/arm64/4.5/library/Rcpp/include/Rcpp/platform/compiler.h:37:10:
fatal error:
'cmath' file not found
37 | #include <cmath>
| ^~~~~~~
To rectify this, I manually prefix to the call to R with
PKG_CXXFLAGS=-I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1
Is there a configuration step I am missing? I believe this is a stock
installation of the R binary from CRAN, and a conventional installation of
Xcode (16.4).
sessionInfo()
R version 4.5.1 (2025-06-13) Platform: aarch64-apple-darwin20 Running under: macOS Sequoia 15.7.2 Matrix products: default BLAS: /Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/lib/libRblas.0.dylib LAPACK: /Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/lib/libRlapack.dylib; LAPACK version 3.12.1
The information in this email is intended only for the p...{{dropped:15}}