Try to add -v 0.7.18
after gem install curb
:
>gem install curb -v 0.7.18 -- --with-curl-lib=C:/curl-7.27.0-devel-mingw32/bin --with-curl-include=C:/curl-7.27.0-devel-mingw32/include
The latest Feedzirra has a curb ~> 0.7.15
as a dependency, so curb-0.8.4
won't be suitable - here is an explanation referring to the bundler site.
Also if you're using something like RVM
(if I remember correctly there's a nearly similar utility for windows called pik
) then ensure that you're installing gems to the gemset used by your application.