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Leena Miettinen authored
Only Qt 5 supported for building docs from 3.3 on. Added info on using https://tinypng.com to shrink PNG files. Change-Id: I450c0cf34e34abc54511fef93e8e5caac5ba89ac Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>
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