I downloaded this: https://github.com/mongodb/mongo-c-driver

And now I'm trying to use it inside my C program, but I don't know what to do with the generated .a files. What are they? I couldn't find any information, not even in the GCC manual.

And I built it like so: 

  scons --c99

Also, can I use C99 libraries with my C89 program?

c gcc shared-libraries
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