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Home/ Questions/Q 8023041
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Editorial Team
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Editorial Team
Asked: June 4, 20262026-06-04T22:26:51+00:00 2026-06-04T22:26:51+00:00

I am using OpenGL lines like glPushMatrix(); on my iPhone app and receiving this

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I am using OpenGL lines like

glPushMatrix();

on my iPhone app and receiving this error:

implicit declaration of function glPushMatrix is invalid in C99.

How do I make Xcode stop whining?

thanks.

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  1. Editorial Team
    Editorial Team
    2026-06-04T22:26:54+00:00Added an answer on June 4, 2026 at 10:26 pm

    The compiler is thinking that the glPushMatrix() command is a function you created. Have you #import-ed the OpenGL framework. If you have, then it probably isn’t linked.

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