[gentoo-user] gem install linecache19 fails

[1126]

Hello, 

I do need the ruby-gem linecache19-0.5.12. Usually, there are two ways to 
install a gem, right? Via emerge and via gem install. But here, only one way 
works. dev-ruby/linecache only builds the 
ruby18-version 
of 
this gem, so I'm stuck with gem install. But gem install fails with the 
following error:

trace_nums.c:(.text+0x22): undefined reference to `ruby_current_thread'


I am using ruby-1.9.3p194, but tried with different versions as well. 

Does anyone have a clue what I can do to solve the problem and get 
linecache19-0.5.12 installed?

Thanks in advance,

Christian.