[R] R install on silicon Mac lacks long.double capability

[Jeff Newmiller]

a) This belongs on r-sig-mac.

b) Apple silicon does not support long double. Run an emulator for an architecture that does, or obtain another computer (e.g. cloud computing?)

c) Don't use homebrew?

On October 23, 2025 8:47:09 AM PDT, Naresh Gurbuxani <naresh_gurbuxani using hotmail.com> wrote:
>On my new macbook pro, I installed R using package installer R-4.5.1-arm64.pkg
>My installation lacks long.double and libxml capabilities.  How can these be enabled?
>
>My installation was in two steps:
>1.  Install Xcode developer tools (sudo xcode-select install), GNU fortran compiler (gfortran-14.2-universal.pkg at cran), gnu readline, liblzma, and pcre2 (using macports), texlive, and Xquartz.  Install R using above package installer.   
>2.  Source install.R from https://mac.r-project.org/bin/.  In sudo R session, run install.libs("r-base-dev").  Reinstall R using above package installer.     
>
>> capabilities()
>       jpeg         png        tiff       tcltk         X11        aqua 
>       TRUE        TRUE        TRUE        TRUE        TRUE        TRUE 
>   http/ftp     sockets      libxml        fifo      cledit       iconv 
>       TRUE        TRUE       FALSE        TRUE        TRUE        TRUE 
>        NLS       Rprof     profmem       cairo         ICU long.double 
>       TRUE        TRUE        TRUE        TRUE        TRUE       FALSE 
>    libcurl 
>       TRUE 
>> sessionInfo()
>R version 4.5.1 (2025-06-13)
>Platform: aarch64-apple-darwin20
>Running under: macOS Sequoia 15.4.1
>
>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
>
>locale:
>[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
>
>time zone: America/New_York
>tzcode source: internal
>
>attached base packages:
>[1] stats     graphics  utils     datasets  grDevices methods   base     
>
>other attached packages:
>[1] latticeExtra_0.6-31 lattice_0.22-7      colorspace_2.1-2   
>
>loaded via a namespace (and not attached):
>[1] compiler_4.5.1     deldir_2.0-4       RColorBrewer_1.1-3 Rcpp_1.1.0        
>[5] interp_1.1-6       jpeg_0.1-11        grid_4.5.1         png_0.1-8         
>> 
>
>nareshgurbuxani$ gfortran --version
>GNU Fortran (GCC) 14.2.0
>Copyright (C) 2024 Free Software Foundation, Inc.
>This is free software; see the source for copying conditions.  There is NO
>warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>______________________________________________
>R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide https://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.

-- 
Sent from my phone. Please excuse my brevity.