ivopavlov87

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Had this issue. Did not need the `-fdeclspec` flag. Just had to do: `gem install thin -v '1.5.1' -- --with-cflags="-Wno-error=implicit-function-declaration"` then was able to do: `gem install mailcatcher` [Qiita Source](https://qiita.com/kazacky/items/ffdc80528e0064447d52)....