message: Add option to limit parallel compile
  Could be useful for memory limited systems like Raspberry Pi Model 3
diff: @@ -90,7 +90,7 @@ def parallel_cpp_compile(self, sources, output_dir=None, macros=None, include_di
  # speed up compilation with: -j = cpu_number() on non Windows machines
  -if os.name != 'nt':
  +if os.name != 'nt' and os.environ.get('DISABLE_PARALLEL_CPP_COMPILE', '') != '1':
  import distutils.ccompiler
  distutils.ccompiler.CCompiler.compile = parallel_cpp_compile
  