* guix/import/gem.scm (make-gem-sexp): Properly handle an empty list of licenses. When rendering a list of licenses, cons 'list onto the front of the expression. * tests/gem.scm: New file. * Makefile.am (SCM_TESTS): Add it.
* gnu/scripts/import.scm (importers): Add "gem". * gnu/import/gem.scm: New file. * gnu/scripts/import/gem.scm: New file. * Makefile.am (MODULES): Add them. * guix.texi ("invoking guix import"): Document it.