Installing "Rgl" Package in R, MAC Osx El Captian

Installing R on OSX Big Sur (EDIT: and Apple M1) for use with Rcpp and openMP

Eventually, I found a process that works on a M1 mac with Big Sur.

• Head over to https://mac.r-project.org/, it contains most things you will need
• Download and install R via R-4.1-branch.pkg. The CRAN version might also work, but I used the installer from mac.r-project.org, which required opening the osx security settings to allow the installation.
• Install RStudio, start it, and let it install the developer tools. Alternatively, run sudo xcode-select --install in Terminal.
• Head to https://mac.r-project.org/openmp/. Download openmp-11.0.1-darwin20-Release.tar.gz and install it (see Terminal commands below).

curl -O https://mac.r-project.org/openmp/openmp-11.0.1-darwin20-Release.tar.gz
sudo tar fvx openmp-11.0.1-darwin20-Release.tar.gz -C /

• Now we need to add compiler flags so that clan uses openMP. In Terminal, create the Makevars file.

cd ~
mkdir .R
nano .R/Makevars

in nano, paste these additional compiler flags into the Makevars file:

CPPFLAGS += -Xclang -fopenmp
LDFLAGS += -lomp

Hit Control+O, Control+X to save and close

• Head over to the gfortran page: https://github.com/fxcoudert/gfortran-for-macOS/releases
• Use the installer gfortran-ARM-11.0-BigSur.pkg to install gfortran.
• For some reason it appears to install in /usr/local/gfortran, but R expects it in /opt. The mac-R team likes to separate arm64 and intel related files. We could go and fix paths, or simply also install gfortran under /opt. Download the tar file gfortran-ARM-11.0-BigSur.tar.xz. You can use curl, or just download it and point tar in the command line to it.

cd /opt/R/arm64/
sudo mkdir gfortran
sudo tar -xzyf gfortran-ARM-11.0-BigSur.tar.xz -C /opt/R/arm64/

(replace gfortran-ARM-11.0-BigSur.tar.xz with /users/YOURUSERNAME/downloads/gfortran-ARM-11.0-BigSur.tar.xz)

Now it should work.

Not an expert in OSX, but doing this so others can figure out how to use my R package. I'd like to streamline the process some more, but wiping the mac, reinstalling osx and testing it takes so much time.

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