well there are of source the docs on gentoo.org for building ebuilds, but in my experience many "broken" ebuilds have often come back to other ebuilds it relies on being outdated or with ciritical features missing. You mentioned png support, is the use flag set for png there? you can use the euse tool in the gentoolkit package to see what it's built with and what it *could* be built with etc... you might want to re-emerge all it's dependencies, or even do a full -deep world build to blow out any cobwobs that could be scaring it.
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