How the hell do I fix an error like this?

I have a source code for a game in Blitz and it won't run because of this error.

Any autists here that can help?

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>games
>winshit
install gentoo

this

You are trying to run/compile a windows 98 program on windows 10 or 7.

>Any autists
Holy fucking kek, its basic programming, declare the missing function

>blitz
For what fucking purpose.

But how?

Your trying to use a function that has no declaration. Find out where the function is being used and figure out where it's been defined.

But I don't know how or where??

The compiler should tell you. Try looking it up.