インストールしようとしています
gem install ruby-filemagic
checking for magic_open() in -lmagic... no
*** ERROR: missing required library to compile this module
*** 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.
Windows 7 でこのエラーを修正するにはどうすればよいですか?