Gems

• Install failure of mysql2 on mac : error “ld: library not found for -lzstd”

  gem install mysql2 -- --with-ldflags=-L$(brew --prefix zstd)/lib
  # or
  bundle config build.mysql2 "-- --with-cflags=\"-Wno-error=implicit-function-declaration\" --with-ldflags=-L$(brew --prefix zstd)/lib"