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Implicit declaration of 'glReadPixels' function invalid in compilation of C99 on ios 8

I have a problem when I try to compile an iOS project with iOS 8.

Error messages:

Implicit declaration of function 'glReadPixels' is invalid in C99 compiling Conflicting types for 'glReadPixels' Declaration of 'glReadPixels' must be imported from module 'OpenGLES.ES3.gl' before it is required
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2 answers

I recently ran into the same problem.

The easiest way to solve this problem is to add the @import OpenGLES; line @import OpenGLES; to every file where you have this message.

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IOS 8 requires import

  #import <OpenGLES/ES3/glext.h>

This link is a solution. Click here ...

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Source: https://habr.com/ru/post/1203297/

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