ERROR: Error installing capybara-webkit:

Any suggestions on how to fix?

gem install capybara-webkit -v '0.11.0'
Building native extensions.  This could take a while...
ERROR:  Error installing capybara-webkit:
        ERROR: Failed to build gem native extension.

        /home/durrantm/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
sh: qmake: not found


Gem files will remain installed in /home/durrantm/.rvm/gems/ruby-1.9.3-p194/gems/capybara-webkit-0.11.0 for inspection.
Results logged to /home/durrantm/.rvm/gems/ruby-1.9.3-p194/gems/capybara-webkit-0.11.0/./gem_make.out

If you are in Ubuntu do

sudo apt-get install qt4-dev-tools libqt4-dev libqt4-core libqt4-gui

If you are on Mac

brew install qt

and then

gem install capybara-webkit -v '0.11.0'

For Ubuntu 16.04

sudo apt-get install qt-sdk

Followed by

gem install capybara-webkit -v '1.11.0' or replace with whatever version you want to install.

You are probably missing the qt libraries. See the capybara-webkit wiki for instructions on installing them for your platform.

brew install qt will only install (as of August 4, 2015) 4.8.6, which gives you this message.

WARNING: The next major version of capybara-webkit will require at least version 5.0 of Qt. You're using version 4.8.6.

Instead, if you do

brew install qt5
brew link --force qt5

you won't get that error.

On El Capitan or Yosemite, you may need to do brew install qt55 according to the doc here.

For Ubuntu 20.04 you can install qt5-default package

sudo apt-get install g++ qt5-default libqt5webkit5-dev gstreamer1.0-plugins-base gstreamer1.0-tools gstreamer1.0-x

Then install the gem with the required version:

gem install capybara-webkit -v '1.11.0'

On fedora is a bit more complicated. I did the next which takes a while:

$ sudo dnf install make gcc-c++ gdb qt5*-devel qt-creator
$ export QMAKE=/usr/bin/qmake-qt5
$ gem install capybara-webkit

Then it worked!

See more info on capybara-webkit wiki