[tlbuild] upmendex test failure on x86_64-solaris

[Mojca Miklavec]

Hi,

The following test fails on x86_64-solaris:

FAIL: tests/upmendex
====================

This is upmendex version 0.50 (TeX Live 2016).
Scanning input file ../../../texk/upmendex/tests/foo.idx....done (3
entries accepted, 0 rejected).
3 entries accepted, 0 rejected.
Sorting index....done(0 comparisons).
Sorting pages....done(4 comparisons).
Making index file....done.
0 warnings, written in foo.ilg1.
Output written in foo.ind1.
This is upmendex version 0.50 (TeX Live 2016).
Scanning dictionary file ../../../texk/upmendex/tests/uni.dict....done.
Scanning input file ../../../texk/upmendex/tests/uni.idx....done (8
entries accepted, 0 rejected).
8 entries accepted, 0 rejected.
Sorting index....done(24 comparisons).
Sorting pages....done(0 comparisons).
Making index file.Segmentation Fault - core dumped
FAIL tests/upmendex.test (exit status: 1)

Any hints appreciated.

Mojca