尝试在 上安装多个 gem cygwin，我不断收到此错误：/usr/share/ruby/2.2.0/mkmf.rb:456:in try_do': The compiler failed to generate an executable file. (RuntimeError)
此错误是以下完整错误消息的一部分：
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
/usr/bin/ruby.exe -r ./siteconf20150603-27012-w371hi.rb extconf.rb
*** 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
[...truncated...]
--without-pkg-config
/usr/share/ruby/2.2.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to …