case $THIS_SUB_DEPENDS in
   SINGLE)     list_find "$FFTW_PRECISION" single     ;;
   DOUBLE)     list_find "$FFTW_PRECISION" double     ;;
   LONGDOUBLE) list_find "$FFTW_PRECISION" longdouble ;;
   THREADS)    [[ "$FFTW_THREADS" = y ]]              ;;
   OPENMP)     [[ "$FFTW_OPENMP"  = y ]]              ;;
   *)
     message "${PROBLEM_COLOR}bogus sub_depends: $SPELL $THIS_SUB_DEPENDS${DEFAULT_COLOR}" ;
     return 1
   ;;
esac
