windows ruby install jsduck error - ruby

Question

I am trying to install jsduck on ruby gem, however I got error.
I've downloaded Ruby 2.3.0(x64).
I've also downloaded DevKit-mingw64-64-4.7.2-20130224-1432-sfx.exe which is for x64.
I installed the ruby 2.3.0(x64). Then I extracted devkit to "C:/rubydevkit"
I ran the below commands in "C:/rubydevkit" folder :
$ruby dk.rb init
and
$ruby dk.rb install
So far, everything is okay. I installed sass successfully by
$gem install sass
However, when I try
$gem install jsduck
or
$gem install rdiscount --platform=ruby
I got followin error:
$ gem install jsduck
ERROR: Error installing jsduck:
ERROR: Failed to build gem native extension.
current directory: C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/rdiscount-2.1.8/ext
C:/Ruby23-x64/bin/ruby.exe -r ./siteconf20160411-6020-6ayo32.rb extconf.rb
checking for random()... no
checking for srandom()... no
checking for rand()... yes
checking for srand()... yes
checking size of unsigned long... 4
checking size of unsigned int... failed
checking size of unsigned short... 2
no int with size 2
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=C:/Ruby23-x64/bin/$(RUBY_BASE_NAME)
--with-rdiscount-dir
--without-rdiscount-dir
--with-rdiscount-include
--without-rdiscount-include=${rdiscount-dir}/include
--with-rdiscount-lib
--without-rdiscount-lib=${rdiscount-dir}/lib
To see why this extension failed to compile, please check the mkmf.log which can be found here:
C:/Ruby23-x64/lib/ruby/gems/2.3.0/extensions/x64-mingw32/2.3.0/rdiscount-2.1.8/mkmf.log
extconf failed, exit code 1
Gem files will remain installed in C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/rdiscount-2.1.8 for inspection.
Results logged to C:/Ruby23-x64/lib/ruby/gems/2.3.0/extensions/x64-mingw32/2.3.0/rdiscount-2.1.8/gem_make.out
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
Below are my current versions versions:
Windows 8.1 64bit
$ gem -v
2.5.1
$ ruby -v
ruby 2.3.0p0 (2015-12-25 revision 53290) [x64-mingw32]

Answer 1

Have you tried using a precompiled windows binary?
You're really running into issues with compiling binary extensions for Ruby. Specifically the rdiscount dependency is failing to compile - you might get better help from rdiscount developers.

Answer 2

RDiscount definitely works on Ruby 2.2.2 on Windows (since this is covered by CI) and in Ruby 2.3.0 on Linux (since this is also covered by CI).
But RDiscount + Ruby 2.3.0 + Windows hasn't been tested yet.
See if you can build successfully with Ruby 2.2.2 on your Windows box.