This is makeindex, version 2.15 [TeX Live 2014] (kpathsea + Thai support).
Scanning style file ./nomencl.ist.......
** Input style error (file = ./nomencl.ist, line = 65):
   -- Unknown specifier lethead_prefix.
** Input style error (file = ./nomencl.ist, line = 66):
   -- Unknown specifier lethead_suffix.
** Input style error (file = ./nomencl.ist, line = 67):
   -- Unknown specifier lethead_flag.
...done (10 attributes redefined, 3 ignored).
Scanning input file tukethesis.glo....done (16 entries accepted, 0 rejected).
Sorting entries....done (70 comparisons).
Generating output file tukethesis.gls....done (66 lines written, 0 warnings).
Output written in tukethesis.gls.
Transcript written in tukethesis.ilg.