安装redis服务器时，执行sudo make test时出现错误

You need tcl 8.5 or newer in order to run the Redis test
Makefile:225: recipe for target ‘test’ failed
make: * [test] Error 1

提示需要安装tcl，解决方法如下

1. wget http://downloads.sourceforge.net/tcl/tcl8.6.1-src.tar.gz
2. udo tar xzvf tcl8.6.1-src.tar.gz -C /usr/local/
3. cd /usr/local/tcl8.6.1/unix/
4. sudo ./configure
5. sudo make
6. sudo make install

安装成功后再执行sudo make test即可`