[DRE-maint] Bug#956212: ruby-roadie-rails: Redmine installation from backports failed

[f.chimi]

Package: ruby-roadie-rails
Version: 1.3.0-2
Severity: normal

Dear Maintainer,

I've installed redmine so:
>apt-get -V -t buster-backports install redmine

the command
>dpkg --configure redmine
returns:


Bundler could not find compatible versions for gem "roadie":
  In Gemfile:
    roadie-rails (~> 1.3) was resolved to 1.3.0, which depends on
      roadie (~> 3.1)

Could not find gem 'roadie (~> 3.1)', which is required by gem 'roadie-rails (~> 1.3)', in
any of the sources.


Thanks
F.C.

-- System Information:
Debian Release: 10.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-8-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages ruby-roadie-rails depends on:
ii  ruby           1:2.5.1
ii  ruby-railties  2:5.2.3+dfsg-1~bpo10+1
ii  ruby-roadie    4.0.0-1

ruby-roadie-rails recommends no packages.

ruby-roadie-rails suggests no packages.

-- no debconf information