The apt package you need to install to use the capybara-webkit rubygem on ubuntu (tested on 10.04 and 11.10) is libqt4-dev. That is, to gem install capybara-webkit, you need to run sudo apt-get install libqt4-dev.
Installing paperclip gem for rails is important to handle file field and image files upload.
Paperclip gem is dependency of imagemagick app.
To install imagemagick in ubuntu 12.x version
sudo apt-get install imagemagick libmagickwand-dev
If you are problem with installing gem install rmagick
then install
sudo apt-get install libdjvulibre-dev libjpeg-dev libtiff4-dev libwmf-dev libmagickcore-dev libmagickwand-dev libmagick++-dev
now install again gem install rmagick
you got it.
thats all..
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