arduino with .a library

Hii i'm using arduino due for few months...

Could anyone tell me how to use/include " .a " library with arduino?

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What is the library and where did you get it from ?

Support for precompiled (.a, .so) files has only very recently been added in Arduino IDE 1.8.6 and newer. In order to activate this feature, the library must have a library.properties file with the precompiled field set to true:

precompiled=true