在利用Web Bench对你的WordPress站点做性能测试时，安装webbench出现了下面的错误：
install -s webbench /usr/local/bin
install -m 644 webbench.1 /usr/local/man/man1
install: cannot create regular file `/usr/local/man/man1': No such file or directory
make: *** [install] Error 1
解决办法就是
mkdir /usr/local/man && make install
