[DRE-maint] Bug#968134: gem2deb: can't parse dependency ruby-rspec-core (!= 2.12.0)

[Pirate Praveen]

Package: gem2deb
Version: 1.2.1

gem2deb rspec_junit_formatter
gives this error

can't parse dependency ruby-rspec-core (!= 2.12.0)

gemsepc has
s.add_runtime_dependency(%q<rspec-core>.freeze, [">= 2", "< 4", "!= 
2.12.0"])

I have manually changed it to ruby-rspec-core (>> 2.12~)

I'm not sure if such conditions can be detected easily, but filing it 
for documenting it.