运行此命令时出现以下错误，请帮忙 gem install mysql --platform = ruby - --with-opt-dir = C：/ mysql-connect or -c-noinstall-6.1.3-winx64
Temporarily enhancing PATH to include DevKit...
Building native extensions with: '--with-opt-dir=C:/mysql-connector-
c-noinstall-6.1.3-winx64'
This could take a while...
ERROR: Error installing mysql:
ERROR: Failed to build gem native extension.
C:/Ruby200/bin/ruby.exe extconf.rb --with-opt-dir=C:/mysql-conne
ctor-c-noinstall-6.1.3-winx64
checking for main() in -llibmysql... no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of neces
sary
libraries and/or headers. Check the mkmf.log file for more details.
You may
need configuration options.
Provided configuration options:
--with-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--curdir
--ruby=C:/Ruby200/bin/ruby
--with-mysql-dir
--without-mysql-dir
--with-mysql-include
--without-mysql-include=${mysql-dir}/include
--with-mysql-lib
--without-mysql-lib=${mysql-dir}/
--with-libmysqllib
--without-libmysqllib
extconf failed, exit code 1
Gem files will remain installed in C:/Ruby200/lib/ruby/gems/2.0.0/ge
ms/mysql-2.9.1 for inspection.
Results logged to C:/Ruby200/lib/ruby/gems/2.0.0/extensions/x86-ming
w32/2.0.0/mysql-2.9.1/gem_make.out
请问我该如何解决这个错误，我已经尝试了许多在线资源，例如下载mysql连接器但没有任何内容