Update README.md
@ -46,7 +46,7 @@ missing development libraries for libxslt, libxml2 and libvirt.
In Ubuntu, Debian, ...
```
$ sudo apt-get install libxslt-dev libxml2-dev libvirt-dev
$ sudo apt-get install libxslt-dev libxml2-dev libvirt-dev zlib1g-dev
In RedHat, Centos, Fedora, ...
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