小弟目前用的一台虚拟机 CentOS 7.3
下载xz5.2.3编译，却无法使用，东搞西搞，用yum reinstall xz把它还原回来等等之类的
后来总之我把/usr/bin/xz弄成5.2.3版
但是我的yum及rpm就不能用
$ yum
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
/lib/liblzma.so.5: version `XZ_5.1.2alpha' not found (required by /lib64/librpmio.so.3)
Please install a package which provides this module, or
verify that the module is installed correctly.
It's possible that the above module doesn't match the
current version of Python, which is:
2.7.5 (default, Nov 6 2016, 00:28:07)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-11)]
If you cannot solve this problem yourself, please go to
the yum faq at:
http://yum.baseurl.org/wiki/Faq
$ rpm
rpm: /lib/liblzma.so.5: version `XZ_5.1.2alpha' not found (required by /lib64/librpmio.so.3)
若下 $ ldd /lib64/librpmio.so.3
/lib64/librpmio.so.3: /lib/liblzma.so.5: version `XZ_5.1.2alpha' not found (required by /lib64/librpmio.so.3)
linux-vdso.so.1 => (0x00007ffe03d9d000)
libnss3.so => /lib64/libnss3.so (0x00007f5636d28000)
libbz2.so.1 => /lib64/libbz2.so.1 (0x00007f5636b18000)
libz.so.1 => /lib64/libz.so.1 (0x00007f5636901000)
libelf.so.1 => /lib64/libelf.so.1 (0x00007f56366e9000)
libpopt.so.0 => /lib64/libpopt.so.0 (0x00007f56364df000)
liblzma.so.5 => /lib/liblzma.so.5 (0x00007f56362b9000) <