This is MakeIndex, version 3.0.8 [31 Dec 91].
Scanning style file monindex.ist...

** Input style error (file = monindex.ist, line = 8):
   -- Unknown style specifier: 'symhead_negative'.** Input style error (file = monindex.ist, line = 9):
   -- Unknown style specifier: 'symhead_positive'.Scanning input file saturne.idx...
done (0 entries accepted, 0 rejected).
Nothing written in saturne.ind.
Transcript written in saturne.ilg.