用tar命令解壓文件的時候出錯了，信息如下：
tar -jvxf jemalloc-3.6.0.tar.bz2 ./nginx/
tar (child): bzip2: Cannot exec: No such file or directory
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now
解決方法很簡單，只要安裝bzip2就行了，yum安裝的命令如下：
yum -y install bzip2
服務器不能聯網，把壓縮包傳上去
tar zxvf bzip2-****.tar.gz
cd bzip2-*****
make && make install