Gem install failing on Ubuntu 17.04

[nickschurch]

Trying to install transrate on my Ubuntu 17.04 and I get:

$ sudo gem install transrate
[sudo] password for nick: 
Fetching: yell-2.0.7.gem (100%)
Successfully installed yell-2.0.7
Fetching: trollop-2.1.2.gem (100%)
Successfully installed trollop-2.1.2
Fetching: facade-1.0.7.gem (100%)
Successfully installed facade-1.0.7
Fetching: pathname2-1.8.0.gem (100%)
Successfully installed pathname2-1.8.0
Fetching: fixwhich-1.0.2.gem (100%)
Successfully installed fixwhich-1.0.2
Fetching: bindeps-1.2.1.gem (100%)
Successfully installed bindeps-1.2.1
Fetching: bio-1.5.1.gem (100%)
Successfully installed bio-1.5.1
Fetching: threach-0.2.0.gem (100%)
Successfully installed threach-0.2.0
Fetching: crb-blast-0.6.9.gem (100%)
Successfully installed crb-blast-0.6.9
Fetching: fix-trinity-output-1.0.0.gem (100%)
Successfully installed fix-trinity-output-1.0.0
Fetching: colorize-0.8.1.gem (100%)
Successfully installed colorize-0.8.1
Fetching: transrate-1.0.1.gem (100%)
Building native extensions.  This could take a while...
ERROR:  Error installing transrate:
    ERROR: Failed to build gem native extension.

    current directory: /var/lib/gems/2.3.0/gems/transrate-1.0.1/ext/transrate
/usr/bin/ruby2.3 -r ./siteconf20170901-27820-132zsr3.rb extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h

extconf failed, exit code 1

Gem files will remain installed in /var/lib/gems/2.3.0/gems/transrate-1.0.1 for inspection.
Results logged to /var/lib/gems/2.3.0/extensions/x86_64-linux/2.3.0/transrate-1.0.1/gem_make.out

This is with Ruby 2.3.3p222. Any idea what the problem is?