R CMD check not looking for gcc in Rtools directory

  • 8 months ago
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When running R CMD check on Windows with Rtools installed, the R CMD check process might not be picking up the correct path to the gcc compiler included in Rtools. This can be due to various reasons, such as incorrect environment variables or the Rtools directory not being added to the system's PATH.

Here are some steps you can take to ensure that R CMD check uses the correct gcc compiler from Rtools:

  1. Check Rtools Installation: Make sure that you have Rtools properly installed on your system. You can download Rtools from the Rtools website and ensure that the installation directory is added to the system's PATH.

  2. Verify PATH: Open a Command Prompt and type gcc. If it's not recognized as a command, it means that the Rtools directory is not in your system's PATH. You should add the Rtools bin directory to the PATH.

  3. Environment Variables: Ensure that the Rtools directory is included in the PATH environment variable. To do this, open a Command Prompt and run:

    sh
    echo %PATH%

    Make sure that the Rtools bin directory (usually something like C:\Rtools\bin) is listed in the PATH.

  4. R Configuration: Run the following R command to configure the use of Rtools for compilation:

    r
    Sys.setenv(PATH = paste("C:/Rtools/bin;", Sys.getenv("PATH"), sep=""))
    
Sys.setenv(BINPREF = "C:/Rtools/mingw_64/bin/")

    Replace "C:/Rtools/" with the actual path to your Rtools installation directory.

  5. Run R CMD check: Now you can run R CMD check from the R console or Command Prompt. The compiler should be picked up from the Rtools directory.

If you're using RStudio, you might also need to set the environment variables within RStudio itself:

  1. Go to "Tools" -> "Global Options" -> "General".
  2. Under "Advanced", there is a section for "R version". You can specify the path to Rtools there.
  3. Make sure to restart RStudio for the changes to take effect.

If you're still having issues, it's possible that there might be conflicts with other installations or environmental variables on your system. It might be helpful to consult the Rtools documentation or seek assistance from the R community or RStudio support.