SWI-Prolog -- Manual

atom_version/2	Translate between atomic version representation and term representation.
pack_attach/2	Attach a single package in Dir.
pack_info/1	Print more detailed information about Pack.
pack_install/1	Install a package.
pack_install/2	Install package Name.
pack_list/1	Query package server and installed packages and display results.
pack_list_installed/0	List currently installed packages.
pack_property/2	True when Property is a property of an installed Pack.
pack_rebuild/0	Rebuild foreign components of all packages.
pack_rebuild/1	Rebuilt possible foreign components of Pack.
pack_remove/1	Remove the indicated package.
pack_search/1	Query package server and installed packages and display results.
pack_upgrade/1	Try to upgrade the package Pack.
pack_url_file/2	True if File is a unique id for the referenced pack and version.
ssl_verify/5	Currently we accept all certificates.