Axel Huebl 9ad3b1a747 libpng: CPPFLAGS for -I (#6563) ...

Recent versions of `libpng` (e.g. 1.6.34) warn/abort that includes
for `zlib` need to be passed properly via `CPPFLAGS`. This fixes it.

2017-12-04 15:29:35 -07:00

..

spack

libpng: CPPFLAGS for -I (#6563)

2017-12-04 15:29:35 -07:00