After Homebrew installs

 To use the bundled libc++ please add the following LDFLAGS:

  LDFLAGS="-L/opt/homebrew/opt/llvm/lib/c++ -Wl,-rpath,/opt/homebrew/opt/llvm/lib/c++"


llvm is keg-only, which means it was not symlinked into /opt/homebrew,

because macOS already provides this software and installing another version in

parallel can cause all kinds of trouble.


If you need to have llvm first in your PATH, run:

  echo 'export PATH="/opt/homebrew/opt/llvm/bin:$PATH"' >> ~/.zshrc


For compilers to find llvm you may need to set:

  export LDFLAGS="-L/opt/homebrew/opt/llvm/lib"

  export CPPFLAGS="-I/opt/homebrew/opt/llvm/include"


poppler-qt5 is keg-only, which means it was not symlinked into /opt/homebrew,

because it conflicts with poppler.


If you need to have poppler-qt5 first in your PATH, run:

  echo 'export PATH="/opt/homebrew/opt/poppler-qt5/bin:$PATH"' >> ~/.zshrc


For compilers to find poppler-qt5 you may need to set:

  export LDFLAGS="-L/opt/homebrew/opt/poppler-qt5/lib"

  export CPPFLAGS="-I/opt/homebrew/opt/poppler-qt5/include"


For pkg-config to find poppler-qt5 you may need to set:

  export PKG_CONFIG_PATH="/opt/homebrew/opt/poppler-qt5/lib/pkgconfig"

  export PKG_CONFIG_PATH="/opt/homebrew/opt/poppler-qt5/share/pkgconfig"



_______
ld: warning: directory not found for option '-L/opt/R/arm64/gfortran/lib/gcc/aarch64-apple-darwin20.6.0/12.0.1'
This is due to no Fortran compiler and it can be solved with an experimental build given that the R is installed at /opt/R/arm64/ via Homebrew

# for R>=4.2.0
curl -O https://mac.r-project.org/tools/gfortran-12.0.1-20220312-is-darwin20-arm64.tar.xz

# unpack
sudo tar fxz gfortran-12.0.1-20220312-is-darwin20-arm64.tar.xz -C /

# /opt/R/arm64/gfortran/SDK has to point to your macOS SDK
# sudo gfortran-update-sdk

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