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Showing content from https://github.com/coatless/r-macos-rtools below:

coatless-mac/r-macos-rtools: Scripts to build an **unofficial** Rtools-esq installer for the macOS R toolchain

This installer has been superceded by the {macrtools} R package, which automatically installs and configures the R toolchain for compiled code on macOS.

Please do not use the r-macos-rtools installer package as it is notably out of date.

The repository contains the scripts used to create an installer package (.pkg) that contains binaries used to create the CRAN official macOS R binary.

Specifically, the installer will try to download and install:

• Xcode command line tools (XCode CLI) from Apple
• gfortran6.3 or gfortran8.2 from https://github.com/fxcoudert/gfortran-for-macOS/releases

Moreover, the installer will attempt to clean up previous installations by removing configuration files ~/.R/Makevars and ~/.Renviron that are no longer used. Backups for each file will be presented with .bck appended to the end.

For those interested, the installer can be obtained on either the project's release page. The pre-built binaries this installer encloses can be found at https://developer.apple.com/download/more/ and https://github.com/fxcoudert/gfortran-for-macOS/releases.

Note The installer package was developed by James Joseph Balamuta and has no connection with the R project’s macOS CRAN maintainers. Financial support was provided to sign the installer by Professor Timothy Bates of the University of Edinburgh.

1. Download it from the project's release page.
2. Open the installer by either double click or right clicking to bring up menu and selecting "Open".
3. From here, navigate through it like a normal macOS installer.

That's it.

Once installed, you can start using compiled code in R like normal.

If you want to see behind the curtain, continue reading...

The macOS R toolchain installer performs four actions that require the user's password to accomplish. These actions are:

1. download and install XCode CLI via secure Apple product update
2. remove any existing ~/.R/Makevars or ~/.Renviron (backups available with .bck)s
3. determine which gfortran version to use
4. download, verify, and install the appropriate gfortran version

Note: The installer will remove any existing ~/.R/Makevars and ~/.Renviron files. The existing files will be copied to a backup file, e.g. ~/.R/Makevars.bck and ~/.Renvion.bck.

Verify steps are conducted using embedded md5 hashes of the files. If the hash is not identical to what was embedded, the installer will exit. For details as to how this was implemented please see Issue 8: Verify pkg hash and the Pull Request 10: Feature Pkg Hash Verification.

Thanks to the financial support provided by Professor Timothy Bates of the University of Edinburgh to join the Apple Developer program. The installer is now signed using developer credentials.

As a result, the installer should have a "lock" icon in the upper right corner:

Clicking the lock icon will reveal the signed developer certificate:

With this being said, the code used to generate the installer has been made publically available under an open source license (GPL >= 2).

Below is an abridged version of the actions of each file provided.

• scripts/postinstall
  • Downloads and Installs Xcode CLI and the appropriate gfortran version
    • Detects the appropriate Command Line Tools dmg installer by using a headless cli check, downloads the installer from https://developer.apple.com/download/more/, and installs it using softwareupdate.
    • Downloads the gfortran binary from https://github.com/fxcoudert/gfortran-for-macOS/releases, and and installs it into /usr/local/gfortran.
  • Removes the ~/.R/Makevars and ~/.Renviron files
  • Note: Pre-existing ~/.R/Makevars and ~/.Renviron files will be backed up prior to being removed.
• make_installer.sh
  • Create the installer package R binary installer .pkg
    • Builds the package from the extracted tar using pkgbuild
    • Analyzing the package using productbuild to create a distribution.xml
    • Inserts customizations into the distribution.xml (title, background, ...)
    • Calls productbuild to rebuild the package.
• distribution.xml
  • Customization options (e.g. title, background) of installer built by analyzing a temporary .pkg
• build_files/Rlogo.png
  • R logo
• build_files/LICENSE.rtf
  • License of the Xcode CLI, LLVM installer, and gfortran
• build_files/WELCOME_DISPLAY.rtf
  • Text displayed on welcome screen

GPL (>= 2)

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