kwin-style-crystal depends on kdebase-dev, which currently depends on kdelibs4-dev (>= 4:3.5.5), which was unsatisfiable during the last build attempt on ARM. Version 4:3.5.5a.dfsg.1-3 of kdelibs4-dev is currently in installed state on ARM, so kwin-style-crystal should be buildable on ARM now too.
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