Напишите пакет. Это грубый набросок, и он нуждается в доработке :
.
(define-module (gnu packages xash3d)
#:use-module (guix packages)
#:use-module (guix git-download)
#:use-module (guix utils)
#:use-module (guix build-system cmake)
#:use-module ((guix licenses) #:select (gpl3))
#:use-module (gnu packages))
(define-public xash3d
(package
(name "xash3d")
(version "0.19.2")
(let (commit (string-append "v" version))
(revision "1"))
(source (origin
(method git-fetch)
(uri (git-reference
(url (string-append "https://github.com/FWGS/" name "/"))
(commit commit)))))
(build-system cmake-build-system)
(synopsis "Xash3D FWGS Engine.")
(description "Xash3D Engine is a custom Gold Source engine rewritten from scratch.")
(home-page "https://xash.su/")
(license gpl3)))
Ресурс:https://www.gnu.org/software/guix/manual/en/html_node/Defining-Packages.html