You've been told several times now that you need to satisfy dependencies, yet you chose to ignore this and continue on. Starting new threads and still not telling people what goes wrong becomes boring for those responding, eventually people stop replying to such things. Nobody wants to have to keep asking you to tell us what you've tried and how it failed.

apt install libxml2 libxml2-dev
-bash: apt: command not found
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The instructions given to you were 'yum install libxml2 libxml2-devel or apt install libxml2 libxml2-dev, or whatever your OS package manager is.', you only need to use the package manager your OS uses, but since you didn't bother to tell us which OS that was.....

yum install libxml2 libxml2-devel
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7S
+erver&arch=x86_64&repo=os&infra=$infra error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown e
+rror"
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Either find out how to configure your system properly, or speak to the systems administrator.