Type Alias PFN_glClearNamedBufferSubDataEXT 

pub type PFN_glClearNamedBufferSubDataEXT = unsafe extern "system" fn(_buffer: GLuint, _internalformat: GLenum, _offset: GLsizeiptr, _size: GLsizeiptr, _format: GLenum, _type: GLenum, _data: *const c_void);