This is makeindex, version 2.15 [TeX Live 2014] (kpathsea + Thai support).
Scanning input file PolymakeInterface.idx....
!! Input index error (file = PolymakeInterface.idx, line = 6):
   -- First argument too long (max 1024).
done (5 entries accepted, 1 rejected).
Sorting entries....done (14 comparisons).
Generating output file PolymakeInterface.ind....done (16 lines written, 0 warnings).
Output written in PolymakeInterface.ind.
Transcript written in PolymakeInterface.ilg.
