[ruby-list:50619] [質問] gem install Chromecast, dnssd エラー対応

山口と申します。

c:\yama\bin\UPnP>ruby --version
ruby 2.4.1p111 (2017-03-22 revision 58053) [x64-mingw32]

の環境で、Ruby で、Chromecast 制御ができればと思い、
https://github.com/robzon/chromecast-ruby　の gem をInstall してみたので
すが、下記のエラーが出ます。

c:\yama\bin\UPnP>gem install chromecast -p 
http://proxy.foo.bar.co.jp:10080
Fetching: ffi-1.9.18-x64-mingw32.gem (100%)
Successfully installed ffi-1.9.18-x64-mingw32
Fetching: ffi-compiler-1.0.1.gem (100%)
Successfully installed ffi-compiler-1.0.1
Fetching: ruby-tls-1.0.3.gem (100%)
Temporarily enhancing PATH for MSYS/MINGW...
Building native extensions.  This could take a while...
ERROR:  Error installing chromecast:
        ERROR: Failed to build gem native extension.

    current directory: C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/ruby-tls-1.
0.3/ext
C:/Ruby24-x64/bin/ruby.exe -rubygems C:/Ruby24-x64/lib/ruby/gems/2.4.0/
gems/rake-12.0.0/exe/rake RUBYARCHDIR=C:/Ruby24-x64/lib/ruby/gems/2.4.0/
extensions/x64-mingw32/2.4.0/ruby-tls
-1.0.3 RUBYLIBDIR=C:/Ruby24-x64/lib/ruby/gems/2.4.0/extensions/x64-
mingw32/2.4.0/ruby-tls-1.0.3
rake aborted!
TypeError: no implicit conversion of nil into String

(See full trace by running task with --trace)

rake failed, exit code 1

Gem files will remain installed in C:/Ruby24-x64/lib/ruby/gems/2.4.0/
gems/ruby-tls-1.0.3 for inspection.
Results logged to C:/Ruby24-x64/lib/ruby/gems/2.4.0/extensions/x64-
mingw32/2.4.0/ruby-tls-1.0.3/gem_make.out

解決方法をご教示いただけないでしょうか？

この、gem 正常にInstall できないので...

同様に、Chromecast 制御ができそうな、
https://github.com/Raven24/rbcast/blob/master/examples/console_remote.rb 
の gem を使おうとしたところ、
c:\temp\rbcast\examples>.\console_remote.rb
C:/Ruby24-x64/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `
require': cannot load such file -- dnssd (LoadError)
        from C:/Ruby24-x64/lib/ruby/2.4.0/rubygems/core_ext/kernel_
require.rb:55:in `require'
        from C:/temp/rbcast/examples/console_remote.rb:26:in `<main>'

となるので、
gem install dnssd
すると、下記のエラーメッセージが出て、対処方法が分からず...
こちらの解決方法も併せて、ご教示いただけないでしょうか？

c:\temp\rbcast\examples>gem install dnssd
Fetching: dnssd-3.0.1.gem (100%)
Temporarily enhancing PATH for MSYS/MINGW...
Building native extensions.  This could take a while...
ERROR:  Error installing dnssd:
        ERROR: Failed to build gem native extension.

    current directory: C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/dnssd-3.0.
1/ext/dnssd
C:/Ruby24-x64/bin/ruby.exe -r ./siteconf20171212-6596-w5cecw.rb extconf.
rb
checking for dns_sd.h... *** 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:/Ruby24-x64/bin/$(RUBY_BASE_NAME)
        --with-warnings
        --without-warnings
        --with-dnssd-dir
        --without-dnssd-dir
        --with-dnssd-include
        --without-dnssd-include=${dnssd-dir}/include
        --with-dnssd-lib
        --without-dnssd-lib=${dnssd-dir}/lib
C:/Ruby24-x64/lib/ruby/2.4.0/mkmf.rb:457:in `try_do': The compiler 
failed to generate an executable file. (RuntimeError)
You have to install development tools first.
        from C:/Ruby24-x64/lib/ruby/2.4.0/mkmf.rb:588:in `try_cpp'
        from C:/Ruby24-x64/lib/ruby/2.4.0/mkmf.rb:1095:in `block in have
_header'
        from C:/Ruby24-x64/lib/ruby/2.4.0/mkmf.rb:945:in `block in 
checking_for'
        from C:/Ruby24-x64/lib/ruby/2.4.0/mkmf.rb:351:in `block (2 
levels) in postpone'
        from C:/Ruby24-x64/lib/ruby/2.4.0/mkmf.rb:321:in `open'
        from C:/Ruby24-x64/lib/ruby/2.4.0/mkmf.rb:351:in `block in 
postpone'
        from C:/Ruby24-x64/lib/ruby/2.4.0/mkmf.rb:321:in `open'
        from C:/Ruby24-x64/lib/ruby/2.4.0/mkmf.rb:347:in `postpone'
        from C:/Ruby24-x64/lib/ruby/2.4.0/mkmf.rb:944:in `checking_for'
        from C:/Ruby24-x64/lib/ruby/2.4.0/mkmf.rb:1094:in `have_header'
        from extconf.rb:7:in `<main>'

To see why this extension failed to compile, please check the mkmf.log 
which can be found here:

  C:/Ruby24-x64/lib/ruby/gems/2.4.0/extensions/x64-mingw32/2.4.0/dnssd-3.
0.1/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in C:/Ruby24-x64/lib/ruby/gems/2.4.0/
gems/dnssd-3.0.1 for inspection.
Results logged to C:/Ruby24-x64/lib/ruby/gems/2.4.0/extensions/x64-
mingw32/2.4.0/dnssd-3.0.1/gem_make.out