Axel Huebl 298f5562c9 Rmlab: Control PNG (#6846) ... Control the find_package of the PNG variant explicitly. This avoids picking up an "external" PNGwriter install in case `~png` is picked by changing the default "AUTO" search to explicit "ON" (required) of "OFF" (ignore if exists).		2018-01-08 09:14:38 -06:00
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spack	Rmlab: Control PNG (#6846)	2018-01-08 09:14:38 -06:00