How to enable curl AsynchDNS?

I want to enable curl AsynchDNS (found in phpinfo ()). What should I do? This is a screenshot: enter image description here

I found the installation of http://c-ares.haxx.se/

c-ares is a C library that performs DNS requests and name resolves asynchronously 

http://curl.haxx.se/dev/readme-ares.html But I still stuck with how curl installations exist.

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libcurl must be compiled and created for it. For Linux and other * nix systems, you can create using c-ares or threaded-resolver to use asynchronous permissions.

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