This is makeindex, portable version 2.12 [26-May-1993].
Scanning style file programs.ist..........
** Input style error (file = programs.ist, line = 51):
   -- Unknown specifier lethead_prefix.
** Input style error (file = programs.ist, line = 52):
   -- Unknown specifier lethead_suffix.
** Input style error (file = programs.ist, line = 53):
   -- Unknown specifier lethead_flag.
...
** Input style error (file = programs.ist, line = 59):
   -- Unknown specifier \endinput.
done (13 attributes redefined, 4 ignored).
Scanning input file programs.idx....done (173 entries accepted, 0 rejected).
Sorting entries....done (1415 comparisons).
Generating output file programs.ind....done (149 lines written, 0 warnings).
Output written in programs.ind.
Transcript written in programs.ilg.
