old_contents: env = {
      'LAPACK': 'lapack',
      'SUNDIALS_LIBS': 'sundials_cvodes,sundials_nvecserial',
  }
  
new_contents: env = {
      'LAPACK': 'lapack',
      'SUNDIALS_LIBS': 'sundials_cvodes,sundials_nvecserial,m',
  }
  
subject: Add 'm' to libs