What have I to do with this error ?
with perl5.14 the 'make test' give an error and I cannot go further
=====================================
libpng 1.6.37: ./test-suite.log
=====================================
# TOTAL: 33
# PASS: 32
# SKIP: 0
# XFAIL: 0
# FAIL: 1
# XPASS: 0
# ERROR: 0
.. contents:: :depth: 2
FAIL: tests/pngtest-badpngs
===========================
Testing libpng version 1.6.37
with zlib version 1.2.5
libpng version 1.6.37
Copyright (c) 2018-2019 Cosmin Truta
Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
Copyright (c) 1996-1997 Andreas Dilger
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
library (10637): libpng version 1.6.37 - April 14, 2019
============================================================================
See ./test-suite.log
Please report to png-mng-implement@lists.sourceforge.net
~~~