Since Ruby 2.1, curses was removed from Ruby standard library. :worried: If you have trouble installing curses gem, follow the instructions below.

## Arch Linux

```
pacman -S base-devel
gem install curses
```

## MSYS2 (Windows)

```
pacman -S base-devel gcc gmp-devel libcrypt-devel ncurses-devel
gem install curses
```