Can you provide me a pre-built x3270 package for Linux?

No, I can't. I'd like to, but I can't.

There are dozens of different Linux distros out there, and multiple versions of each. I don't have a fleet of machines running every possible one, nor does it make sense for me to spin up a VM with some particular version of Linux and figure out how to build the code on it, every time there is a request. I maintain the source code in a portable form, and leave it to the maintainers of each distro to take care of getting the latest x3270 on it.

This is one of the reasons that the Linux community works: the division of labor between the people who create the pieces of software that can run on any Linux, and the people who package that software into different distros. I can't maintain packages for each distro in the same way that the maintainer of some particular Linux distro doesn't have the resources to write a 3270 emulator from scratch.

I do provide instructions for building everything from source, but I don't necessarily know (1) exactly which packages you need on your system to do that, and (2) subtleties of how to install it on your particular distro.