尝试在上安装多个gem时cygwin，出现此错误：/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 install development tools first.
from /usr/share/ruby/2.2.0/mkmf.rb:541:in `try_link0'
from /usr/share/ruby/2.2.0/mkmf.rb:556:in `try_link'
from /usr/share/ruby/2.2.0/mkmf.rb:637:in `try_ldflags'
from /usr/share/ruby/2.2.0/mkmf.rb:1780:in `pkg_config'
from extconf.rb:15:in `<main>'
extconf failed, exit code 1
Gem files will remain installed in /cygdrive/d/d/.gem/ruby/gems/ffi-1.9.8 for inspection.
Results logged to /cygdrive/d/d/.gem/ruby/extensions/x86_64-cygwin/ffi-1.9.8/gem_make.out
我尝试了所有我可以在google上找到的东西，其中有些确实有效，包括：
但是对于这个非常具体的示例，我找不到丢失的内容...
针对该错误的解决方案是（并且针对所有此类错误）查看mkmf.log文件（对我而言/cygdrive/d/d/Documents/.gem/ruby/extensions/x86_64-cygwin/ffi-1.9.8/mkmf.log），并查看缺少哪些库。
以我为例，-lcrypt并且-lgmp失败了，所以我不得不“ cygwin-setup”libcrypt-devel和libgmp-devel。
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我来说两句