configure warnings and errors upon ./configure for Pinentry v0.9.7

[David Adamson]

On Mon, Nov 21, 2016 at 4:16 AM, Werner Koch <wk at gnupg.org> wrote:

>> configure: error: No pinentry enabled.
>
> You need to install the appropriate development package for the GUI
> platform.

I looked for a GUI platform but had no idea what it's called where to
find it and why I need a GUI if I plan on using purely command line
interface.

Would It be:
"GPA is a graphical frontend to GnuPG"

Thanks for your help!