[DRE-maint] Bug#919805: redmine: FTBFS (Could not find gem mail)

[Santiago Vila]

Package: src:redmine
Version: 3.4.6-1
Severity: serious
Tags: ftbfs

Dear maintainer:

I tried to build this package in buster but it failed:

--------------------------------------------------------------------------------
[...]
 debian/rules build-indep
dh build-indep
   dh_update_autotools_config -i
   dh_autoreconf -i
   debian/rules override_dh_auto_configure
make[1]: Entering directory '/<<PKGBUILDDIR>>'
./debian/check-locales
bundle --local --quiet
`/sbuild-nonexistent` is not a directory.
Bundler will use `/tmp/bundler-20190119-2834-1oobqh6' as your home directory temporarily.
Could not find gem 'mail (~> 2.6.4)' in any of the gem sources listed in your
Gemfile.
make[1]: *** [debian/rules:9: override_dh_auto_configure] Error 7
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:5: build-indep] Error 2
dpkg-buildpackage: error: debian/rules build-indep subprocess returned exit status 2
--------------------------------------------------------------------------------

(The above is just how the builds ends and not necessarily the most relevant part)

The build was made in my autobuilder with "dpkg-buildpackage -A"
and it also fails here:

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/redmine.html

where you can get a full build log if you need it.

If this is really a bug in one of the build-depends, please use reassign and affects,
so that this is still visible in the BTS web page for this package.

Thanks.