Compilation error: error: ‘glDeleteVertexArrays’ was not declared in this scope

[Olumide]

I'm trying to compile a graphics library (NGL, 
http://nccastaff.bournemouth.ac.uk/jmacey/GraphicsLib/index.html), with 
OpenGL dependencies. in the Cygwin environment but I'm getting the error 
message,

‘glDeleteVertexArrays’ was not declared in this scope
What might the reason for this error?

Thanks,

- Olumide



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