Hi sandbo and welcome to IPFire,
you can find git and make in the Pakfire resources as addons, gcc is available in the toolchains for the development environment. In here --> https://wiki.ipfire.org/devel you can find the references.
If you want to build and implement Wireguard by yourself on IPFire, keep in mind that the kernel moduls are signed while compilation and can not easily be integrated, a discussion about that are findable e.g. in here --> How can i use self compiled kernel module .
According to Wireguard, this article --> https://blog.ipfire.org/post/why-not-wireguard from Michael can give you an overview of a potential future handling of Wireguard on IPFire. The community platform offers also threads for this topic, just checkout the search in here.
Some infos from here.
Best,
Erik