Common modules

(use-modules (guix packages)
            (guix licenses) #:prefix license:)
            (guix download)
            (guix git-download)
            (guix gexp)
            (guix build-system python)
            (gnu packages ruby)
            (guix build-system ruby)
            (guix build-system pyproject)
            (gnu packages check)
            (gnu packages admin)
            (gnu packages compression)
            (gnu packages databases)
            (gnu packages version-control)
            (gnu packages linux)
            (gnu packages video)
            (gnu packages xorg)
            (gnu packages graph)
            (gnu packages machine-learning)
            (gnu packages geo)
            (gnu packages serialization)
            (gnu packages sphinx)
            (gnu packages django)
            (gnu packages time)
            (gnu packages tcl)
            (gnu packages python)
            (gnu packages qt)
            (gnu packages xml)
            (gnu packages python-crypto)
            (gnu packages python-web)
            (gnu packages python-science)
            (gnu packages python-check)
            (gnu packages python-build)
            (gnu packages python-xyz))