最近要用到导入联系人的功能.但是gem install contacts却报错.
错误如下:
Building native extensions. This could take a while...
ERROR: Error installing contacts:
ERROR: Failed to build gem native extension.
c:/ruby/bin/ruby.exe extconf.rb install contacts
creating Makefile
nmake
'nmake' 不是内部或外部命令，也不是可 ...
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