Windows 7 でプロジェクトをビルドするためにいくつかの依存関係をインストールしようとしています。必要だと思った Ruby の依存関係で Cygwin をインストールしました。
実行するgem install buildr
と、次のエラーが表示されます。助言がありますか?
$ gem install buildr
Building native extensions. This could take a while...
ERROR: Error installing buildr:
ERROR: Failed to build gem native extension.
/usr/bin/ruby.exe extconf.rb
checking for jni.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=/usr/bin/ruby
/usr/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate
an executable file. (RuntimeError)
You have to install development tools first.
from /usr/lib/ruby/1.9.1/mkmf.rb:506:in `try_cpp'
from /usr/lib/ruby/1.9.1/mkmf.rb:931:in `block in have_header'
from /usr/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for'
from /usr/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone'
from /usr/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /usr/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone'
from /usr/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /usr/lib/ruby/1.9.1/mkmf.rb:280:in `postpone'
from /usr/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for'
from /usr/lib/ruby/1.9.1/mkmf.rb:930:in `have_header'
from extconf.rb:58:in `create_rjb_makefile'
from extconf.rb:77:in `<main>'
Gem files will remain installed in /usr/lib/ruby/gems/1.9.1/gems/rjb-1.4.0 for inspection.
Results logged to /usr/lib/ruby/gems/1.9.1/gems/rjb-1.4.0/ext/gem_make.out