Here is a patch for pngcrush.
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We have optipng which has better compression/quality than pngcrush.
http://pointlessramblings.com/posts/pngquant_vs_pngcrush_vs_optipng_vs_pngnq/
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@Justin not that I care if optipng gets included, but it's lossless, while pngquant is lossy. Also, zopflipng yielded the best (lossless) results in my testing, though last I checked it was not packaged on Solus.