Hey!

As far as I know, it's a standard library in C. And those engine_open, engine_close, etc functions are SDK functions.
https://en.m.wikibooks.org/wiki/C_Programming/stdlib.h

Edit: maybe I misunderstood your question. If you want to find the <stdlib.h> I guess you should check your IDE (f.e. visual studio) or C compiler.

Best regards!

Last edited by 3run; 05/26/20 19:28.
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