In order to use the default GPG pinentry program, install one of the following Linux packages:
```
$ apt install pinentry-{curses,gnome3,qt}
```
or (on macOS):
```
$ brew install pinentry-mac
```
By default a standard GPG PIN entry program is used when entering your Trezor PIN, but it's difficult to use if you don't have a numeric keypad or want to use your mouse.
By default a standard GPG PIN entry program is used when entering your Trezor PIN, but it's difficult to use if you don't have a numeric keypad or want to use your mouse.
You can specify a custom PIN entry program such as [trezor-gpg-pinentry-tk](https://github.com/rendaw/trezor-gpg-pinentry-tk) (and separately, a passphrase entry program) to match your workflow.
You can specify a custom PIN entry program such as [trezor-gpg-pinentry-tk](https://github.com/rendaw/trezor-gpg-pinentry-tk) (and separately, a passphrase entry program) to match your workflow.