[DRE-maint] Bug#876269: ftbfs, building indep packages

[Matthias Klose]

Package: src:ruby-psych
Version: 2.2.4-6
Severity: serious
Tags: sid buster

The package fails to build the indep packages:

   debian/rules override_dh_auto_build-indep
make[1]: Entering directory '/<<PKGBUILDDIR>>'
jruby -S rake compile
/usr/share/jruby/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:55:in
`require':
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.
rake aborted!
LoadError: no such file to load -- psych
/<<PKGBUILDDIR>>/Rakefile:1:in `(root)'
/<<PKGBUILDDIR>>/Rakefile:13:in `block in (root)'
(See full trace by running task with --trace)
debian/rules:9: recipe for target 'override_dh_auto_build-indep' failed
make[1]: *** [override_dh_auto_build-indep] Error 1
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
debian/rules:6: recipe for target 'build' failed
make: *** [build] Error 2