Axel Huebl ba06eb72d0 libpng: zlib path (#5581) ... explicitly set the zlib path for libpng configure. fixes: ``` [ ... ] 92 checking for memset... yes 93 checking for pow... no 94 checking for pow in -lm... yes 95 checking for clock_gettime... yes 96 checking for zlibVersion in -lz... no 97 checking for z_zlibVersion in -lz... no >> 98 configure: error: zlib not installed ```		2017-10-03 14:58:28 -06:00
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spack	libpng: zlib path (#5581)	2017-10-03 14:58:28 -06:00