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r_source_packages_macos.md

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Step-by-step Instructions to install R packages from source on macos in 2020\n (most recent test on macos10.15.5 and R3.6.2)\n\n There is a known issue with openmp and clang when installing from source on macos - heres the fix.\n\n

  1. brew install llvm

  2. cat << EOF >> ~/.R/Makevars
    GCC_VERS="10.1.0"
    LLVM_VERS="10.0.0_3"
    CC=/usr/local/Cellar/llvm/${LLVM_VERS}/bin/clang
    CXX=/usr/local/Cellar/llvm/${LLVM_VERS}/bin/clang++
    CXX1X=/usr/local/Cellar/llvm/${LLVM_VERS}/bin/clang++
    LDFLAGS=-L/usr/local/Cellar/llvm/${LLVM_VERS}/lib -Wl,-rpath,/usr/local/Cellar/llvm/${LLVM_VERS}/lib
    CXXFLAGS=-I/usr/local/Cellar/llvm/${LLVM_VERS}/include
    FLIBS=-L/usr/local/Cellar/gcc/${GCC_VERS}/lib/gcc/10
    EOF

NOTE: version numbers are lieky to change very quickly so this will need to be confirmed on next install