The GNU Transport Layer Security Library is used to dissect SSL and TLS protocols (aka: HTTPS).
If this library isn’t already installed or available as a package for your platform, you can get it at https://www.gnu.org/software/gnutls/download.html.
We provide a package cross-compiled using MinGW32 at https://anonsvn.wireshark.org/wireshark-win32-libs/trunk/packages/.