RcppArmadillo version 0.10.6.0.0 in MacOS X 11.5

Prevent error in install RcppArmadillo version 0.10.6.0.0

First install gcc with macbrew 

First install homebrew, using in terminal:
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Then install llvm
brew install --with-clang llvm

In /usr/local/opt/gcc, there is a symlink to the last gcc version installed by homebrew.

then, in terminal, do:

sudo mkdir /usr/local/gfortran/

sudo ln -s /usr/local/opt/gcc/lib/gcc/11 /usr/local/gfortran/lib

sudo mkdir /usr/local/gfortran/lib/gcc/x86_64-apple-darwin18/

sudo ln -s /usr/local/opt/gcc/lib/gcc/11 /usr/local/gfortran/lib/gcc/x86_64-apple-darwin18/8.2.0

And in R:

install.packages("RcppArmadillo")


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