code: def generate(env):
      
      add_all_to_env(env)
  
      fcomp = env.Detect(compilers) or 'f90'
      env['FORTRAN']  = fcomp
      env['F90']      = fcomp
  
      env['SHFORTRAN']  = '$FORTRAN'
      env['SHF90']      = '$F90'
  
      env['SHFORTRANFLAGS'] = SCons.Util.CLVar('$FORTRANFLAGS -KPIC')
      env['SHF90FLAGS'] = SCons.Util.CLVar('$F90FLAGS -KPIC')
docs: Add Builders and construction variables for sun f90 compiler to an
      Environment.