CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_EXPORT_NO_PACKAGE_REGISTRY


libvpx/1.9.0: WARN: Error running `configure --help`: Error 1 while executing source_subfolder/configure --help
ERROR: libvpx/1.9.0 (test package): Error in test() method, line 16
	self.run(bin_path, run_environment=True)
	NameError: name 'bin_path' is not defined