I don't get it.
Being a new user for Linux is seriously a nightmare. Every customization that requires "building" always results in errors.
Hi @gakun17, I'm sorry you're going through this, but with time you'll learn to work around these issues, hang in there =), things will get better.
Regarding your issue, Windy depends on two libraries: SDL3 and SDL3_ttf. If these libraries don't exist on your system, CMake will try to download them, which is what happened according to the .txt file you attached.
The problem is that SDL3_ttf depends on FreeType (for rendering TTF fonts), and your system apparently doesn't have this library.
To install it, just do something like:
Debian-based: sudo apt install libfreetype-dev
Fedora: sudo dnf install freetype-devel
RHEL-based: sudo yum install freetype-devel
Arch Linux: sudo pacman -S freetype2
...