Xcode error - OpenFrameworks example projects giving 'Use of undeclared identifier Error'

Question

I am trying to run any of unaltered OpenFramworks examples on Xcode that are available from their website https://openframeworks.cc/download/ and they all give me the a list of similar errors, all related to GL:

  use of undeclared identifier 'GL_TEXTURE_RECTANGLE_ARB'
            textureTarget = GL_TEXTURE_RECTANGLE_ARB;
                            ^

  use of undeclared identifier 'GL_TEXTURE_RECTANGLE_ARB'
bNormalized = (inTexture.getTextureData().textureTarget!=GL_TEXTURE_...
                                                         ^

I haven't altered any projects and running ALL of them reproduce the same errors.. What can I do to solve this?

• Unrelated, but might be related - I previously brew installed GLFW, GLEW and GLM using homebrew because I'm learning OpenGL.. does this matter?