doc: Mark zlib as mandatory, libbz2 as optional.

* doc/guix.texi (Requirements): Move zlib to mandatory and libbz2 to
optional.
* README: Ditto.

1 files changed, 2 insertions, 1 deletions

diff --git a/README b/README
index 4192eb41299..d96a43bbefc 100644
--- a/README
+++ b/README
@@ -25,13 +25,14 @@ GNU Guix currently depends on the following packages:
   - [[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
 
 Unless `--disable-daemon' was passed, the following packages are needed:
 
   - [[https://sqlite.org/][SQLite 3]]
-  - [[http://www.bzip.org][libbz2]]
   - [[https://gcc.gnu.org][GCC's g++]]
+  - optionally [[http://www.bzip.org][libbz2]]
 
 When `--disable-daemon' was passed, you instead need the following: