[DRE-maint] Bug#891270: ruby-fog FTBFS: Could not find 'json' (~> 2.0) - did find: [json-1.8.3.1]

[Adrian Bunk]

Source: ruby-fog
Version: 1.42.0-1
Severity: serious

https://buildd.debian.org/status/fetch.php?pkg=ruby-fog&arch=all&ver=1.42.0-1&stamp=1519421760&raw=0

...
GEM_PATH=debian/ruby-fog/usr/share/rubygems-integration/all:/var/lib/gems/2.3.0:/usr/lib/x86_64-linux-gnu/rubygems-integration/2.3.0:/usr/share/rubygems-integration/2.3.0:/usr/share/rubygems-integration/all ruby2.3 -e gem\ \"fog\"
/usr/lib/ruby/2.3.0/rubygems/dependency.rb:319:in `to_specs': Could not find 'json' (~> 2.0) - did find: [json-1.8.3.1] (Gem::LoadError)