'bazaar.scm' is for testing.  The following warnings appear during the
installation:

GNU gettext msgfmt utility not found!

patch-shebang: ./tools/packaging/lp-upload-release: warning: no binary for interpreter `zsh' found in $PATH

patch-shebang: ./tools/weavemerge.sh: warning: no binary for interpreter `zsh' found in $PATH

Can we replace 'zsh' with 'bash'?  I guess there may be some
compatibility problems.

Should we package 'zsh' instead?  I haven't checked, but it seems there
are two tarballs: the first one contains sources and the second contains
docs.  Is there a way to specify both in a single recipe?

Also, I should mention that I don't understand some parts of the build
system.  I'm not sure how to check them.  Is there a Scheme level
'strace'-like tool?  If not, I'll send more specific questions later.