I've got gcc and ancillary tools installed via homebrew on my system, which works fine in standalone R, but when I try to install packages in RStudio, it uses the XCode version, which often leads to errors since it doesn't link the the right libraries, etc. For example, within RStudio:
> system("gcc --version") Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/4.2.1 Apple clang version 11.0.0 (clang-1188.8.131.52) Target: x86_64-apple-darwin18.7.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
But within standalone R:
> system("gcc --version") gcc (Homebrew GCC 9.2.0_3) 9.2.0 Copyright (C) 2019 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
I've tried setting it in ~/.R/Makevars, but RStudio doesn't seem to use this file.
Any idea how I can get RStudio to use the right compiler?