Error:
linking shared-object mysql2/mysql2.bundle
ld: library not found for -lzstd
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [mysql2.bundle] Error 1
How to fix:
bundle config --local build.mysql2 "--with-opt-dir="$(brew --prefix zstd)" --with-ldflags=-L"$(brew --prefix zstd)"/lib"
sudo bundle install