[DRE-maint] Bug#762133: ruby-kakasi-ffi: FTBFS: can't load libkakasi.so (DL::DLError)

[Aaron M. Ucko]

Source: ruby-kakasi-ffi
Version: 1.0.1-1
Severity: serious
Justification: fails to build from source

Builds of ruby-kakasi-ffi in minimal environments (notably, the
autobuilders) have been failing:

  /usr/lib/ruby/2.1.0/dl/import.rb:68:in `rescue in block in dlload': can't load libkakasi.so (DL::DLError)
  	from /usr/lib/ruby/2.1.0/dl/import.rb:65:in `block in dlload'
  	from /usr/lib/ruby/2.1.0/dl/import.rb:56:in `collect'
  	from /usr/lib/ruby/2.1.0/dl/import.rb:56:in `dlload'
  	from extconf.rb:49:in `block in <module:KakasiExtConf>'
  	from /«PKGBUILDDIR»/lib/kakasi/platform.rb:55:in `try_load'
  	from extconf.rb:46:in `<module:KakasiExtConf>'
  	from extconf.rb:8:in `<main>'

Could you please declare a build dependency on libkakasi2-dev and
confirm with pbuilder or the like that you haven't missed any others?

Thanks!