message: the threads flag in NTL damages scapi compilation
diff: 'NTL_DISABLE_LONGLONG' => 'off',
  'NTL_MAXIMIZE_SP_NBITS' => 'off',
  'NTL_LEGACY_SP_MULMOD' => 'off',
  -'NTL_THREADS' => 'on',
  +'NTL_THREADS' => 'off',
  'NTL_EXCEPTIONS' => 'off',
  'NTL_THREAD_BOOST' => 'off',
  'NTL_GMP_LIP' => 'on',
  