ruby gtk3 gem installation

#!/usr/bin/env bash
#
# Install Ruby and GTK3 on linux (Fedora 23)
#
# Currently unable to install ruby gems, as it give the following error:
# ERROR:  Error installing gtk3:
# ERROR: Failed to build gem native extension.
#
# Looking into the log files (~/.gem/ruby/extensions/x86_64-linux/nokogiri-1.6.7.1/mkmf.log)
# Shows the following error:
# gcc: error: /usr/lib/rpm/redhat/redhat-hardened-cc1: No such file or directory
#
# Found a fix for this bug on the Ironic bugtracker on launchpad:
# https://bugs.launchpad.net/ironic/+bug/1527614
# which basically says to install redhat-rpm-config
#


# install ruby
sudo dnf install ruby-devel

# install gtk3
sudo dnf install gtk3-devel

# install rpm-config to fix error in gtk3 gem installation:
sudo dnf install redhat-rpm-config

# install the gtk3 ruby gem
gem install gtk3