Chrony will build without nts support

I’m currently trying to build chrony from source (apt has the same problem), but after I do my ./configure, I get
I would like NTS, and so I’m not sure why it’s not included here. Anyone have experience with this?

You need to install development files for the nettle and gnutls libraries. gnutls needs to be at least version 3.6.4 to have support for TLS1.3.

What OS are you using? There might already be an unofficial package with NTS support enabled.

I’m on raspbian. Will take a look about those being installed.