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
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spack	libpng: CPPFLAGS for -I (#6563)	2017-12-04 15:29:35 -07:00