Fixing errors installing the charlock_holmes ruby gem

This gem can be a PITA to install on a mac, this is what worked for me. If you get this error:

First, make sure you have installed the required dependencies:

brew install xz icu4c

Now, install charlock_holmes:

gem install charlock_holmes -v=0.7.6 -- --with-opt-dir=/usr/local/opt --with-opt-include=/usr/local/opt/icu4c/include --with-opt-lib=/usr/local/opt/icu4c/lib --with-cxxflags=-std=c++11

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