- - [[http://gnu.org/software/guile/][GNU Guile 2.0.x]], version 2.0.5 or later
- - [[http://gnupg.org/][GNU libgcrypt]]
+ - [[https://gnu.org/software/guile/][GNU Guile 2.2.x or 2.0.x]], version 2.0.13 or later
+ - [[https://gnupg.org/][GNU libgcrypt]]
+ - [[https://www.gnu.org/software/make/][GNU Make]]
+ - [[https://www.gnutls.org][GnuTLS]] compiled with guile support enabled.
+ - [[https://gitlab.com/guile-git/guile-git][Guile-Git]]
+ - [[http://www.zlib.net/][zlib]]
+ - optionally [[https://savannah.nongnu.org/projects/guile-json/][Guile-JSON]], for the 'guix import pypi' command