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XCode 6 Deleting Textures

Hi,

 

since upgrading to xcode 6 and deploying my code with Vuforia SDK 3.0.9 to an iOS 8 device I cannot prevent memory leaks by a

 glDeleteTextures(1, &textureId);

during deallocation of textures and loading bitmaps for generating new textures (like in the image targets example with interchangable textures)

 

The error during build is:

 Use of undeclared identifier 'glDeleteTextures'

 

Does anyone has a solution for fixing that?

 

Greetings