R help - Mar 2025 - MacPorts install of data.table lacks openmp support

In the past I have been able to install data.table with openmp support.
Recently I upgraded to Sequoia and needed to reinstall R and various
packages.  My new install of data.table lacks openmp support.  Has
anyone been able to use MacPorts to install data.table with openmp
support?

I have an Intel mac mini with Sequoia 15.3.2
I installed gfortran 14.2 using package available at
https://mac.r-project.org.  Then I installed openmp support (17.0.6) using
package available at https://mac.r-project.org/openmp/.  liblzma, pcre2,
and bzip2 were installed by MacPorts. I do not have a Makevars file.
Without Makevars file, in the past I had successfully installed
data.table with openmp support.   

Thanks,
Naresh

~ $ which gfortran 
/usr/local/bin/gfortran
~ $ gfortran --version
GNU Fortran (GCC) 14.2.0
~ $ clang --version
Apple clang version 16.0.0 (clang-1600.0.26.6)
Target: x86_64-apple-darwin24.3.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
~ $ which clang 
/usr/bin/clang
~ $ ls /usr/local/lib/libomp.dylib 
/usr/local/lib/libomp.dylib
~ $ ls /usr/local/include/omp-tools.h 
/usr/local/include/omp-tools.h
~ $ ls /usr/local/include/omp.h 
/usr/local/include/omp.h
~ $ ls /usr/local/include/ompt.h 
/usr/local/include/ompt.h
~ $ port installed xz*
The following ports are currently installed:
  xz @5.6.4_0 (active)
  xz-bootstrap @5.6.4_0 (active)
~ $ port installed pcre2 bzip2
The following ports are currently installed:
  bzip2 @1.0.8_0 (active)
  pcre2 @10.45_0 (active)
~ $ export $LDFLAGS
declare -x CLICOLOR="1"
declare -x COLUMNS="92"
declare -x DISPLAY="Macmini.fios-router.home"
declare -x
EDITOR="/Applications/MacPorts/Emacs.app/Contents/MacOS/Emacs"
declare -x EMAIL="naresh_gurbuxani at hotmail.com"
declare -x HOME="/Users/nareshgurbuxani"
declare -x INFOPATH=":/usr/local/texlive/2024/texmf-dist/doc/info"
declare -x INSIDE_EMACS="29.4,comint"
declare -x LANG="en_US.UTF-8"
declare -x LOGNAME="nareshgurbuxani"
declare -x LSCOLORS="GxFxCxDxBxegedabagaced"
declare -x MANPATH=":/usr/local/texlive/2024/texmf-dist/doc/man"
declare -x NAME="Naresh Gurbuxani"
declare -x OLDPWD
declare -x
PATH="/usr/local/texlive/2024/bin/universal-darwin:/opt/local/libexec/gnubin:/opt/local/bin:/opt/local/sbin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/usr/local/texlive/2024/bin/universal-darwin"
declare -x PS1="\\W \$ "
declare -x PWD="/Users/nareshgurbuxani"
declare -x SHELL="/bin/bash"
declare -x SHLVL="2"
declare -x
SSH_AUTH_SOCK="/private/tmp/com.apple.launchd.Wok8stg6Ex/Listeners"
declare -x TERM="dumb"
declare -x TERMCAP=""
declare -x TERM_PROGRAM="Apple_Terminal"
declare -x TERM_PROGRAM_VERSION="455"
declare -x TERM_SESSION_ID="32510F68-CEC8-48D1-9C02-4A8B7B6F18D2"
declare -x TMPDIR="/var/folders/nb/2vppcjgd19l_h9brvzgdjcm40000gn/T/"
declare -x USER="nareshgurbuxani"
declare -x XPC_FLAGS="0x0"
declare -x XPC_SERVICE_NAME="0"
declare -x __CFBundleIdentifier="com.apple.Terminal"
declare -x __CF_USER_TEXT_ENCODING="0x1F5:0x0:0x0"
~ $ xcode-select --version
xcode-select version 2409.
~ $ port installed R
The following ports are currently installed:
  R @4.4.3_0+aqua+builtin_lapack+cairo+gcc14+openmp+tcltk+x11 (active)
~ $ Rscript -e 'sessionInfo()'
R version 4.4.3 (2025-02-28)
Platform: x86_64-apple-darwin24.3.0
Running under: macOS Sequoia 15.3.2

Matrix products: default
BLAS:  
/opt/local/Library/Frameworks/R.framework/Versions/4.4/Resources/lib/libRblas.dylib
LAPACK:
/opt/local/Library/Frameworks/R.framework/Versions/4.4/Resources/lib/libRlapack.dylib;
LAPACK version 3.12.0

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  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
[1] compiler_4.4.3
~ $

Hello Naresh,

If you don't get a good answer here, consider asking later at
R-SIG-Mac at R-project.org.

? Sun, 16 Mar 2025 20:28:49 +0000
Naresh Gurbuxani <naresh_gurbuxani at hotmail.com> ?????:
> I installed gfortran 14.2 using package available at
> https://mac.r-project.org.  Then I installed openmp support (17.0.6)
> using package available at https://mac.r-project.org/openmp/.
These are needed to build source packages for the CRAN build of R using
the Apple toolchain. Although if you install the CRAN build of R, it
should be possible to install the pre-built packages, including
data.table, with OpenMP support. (CRAN builds of R for macOS include
their own copy of OpenMP runtime starting with R-4.3.)
> ~ $ which gfortran 
> /usr/local/bin/gfortran
> ~ $ gfortran --version
> GNU Fortran (GCC) 14.2.0
> ~ $ clang --version
> Apple clang version 16.0.0 (clang-1600.0.26.6)
> Target: x86_64-apple-darwin24.3.0
> Thread model: posix
> InstalledDir: /Library/Developer/CommandLineTools/usr/bin
Doesn't the MacPorts build of R use its own toolchain?
https://github.com/macports/macports-ports/blob/bc07a46df685778bc33530c2dd09050be07a6a41/math/R/Portfile#L40-L41

Check the output of R CMD config CC (is it /opt/local/bin/clang-mp-18?)
and try to find out how to enable OpenMP support for that compiler.
Does it need a separate installation of the libomp port?

-- 
Best regards,
Ivan