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On mac, I found data.table installation much simpler than described above. There was no need to use Makevars file. After OpenMP was installed, simply typing "sudo port install r-data.table +openmp" worked. A similar solution likely exists for HomeBrew also.
Addendum for clarity
Updated Installation (markdown)
updated "OpenMP below" URL to be correct / sentence cased "Enable OpenMP for macOS"
reproduced the contributed procedure on a second machine and added the install command
enhanced my contribution. Please move somewhere else if you think it belongs in another part of the page.
I added a section for a GFortran 12.2 version and correct Makevars on Apple M1 under Ventura ... especially for non-brew users who prefer Macports
Add solution for macOS error Library not loaded: /opt/X11/lib/libSM.6.dylib
updated with info on arm64 macOS brew paths from #5419
Add libomp option for macOS as preferred option
Reference to required Makevars for fst (macOS) added.
Update ARM / M1 Mac install instructions (according to #5271, verified on my own M1 MacBook Pro).
load -> attach
added brew gcc install option
Path fix for GNU fortran LDFLAGS config. Otherwise will see "ld: warning: argument missing after -rpath" warning.
version bump
adding error troubleshooting for TARGET_OS_IPHONE on mac catalina
1.13.6 accepted on CRAN 30 Dec 2020
Added Mac install options with GNU fortran complier (Tested on Big Sur)
Bump dev version. CRAN submission still stuck with no reply about revdep prt so isn't yet on CRAN
Bump version
Updated mac installation instructions for macports users
1.13.0 released; update headings
Add instructions for 'datatable.so not found' during installation (see #4574).
Install development version on Windows on older version of R requires installation from source as the pre-compiled binary file only works with recent version of R (matching major version).