Arch currently uses optional dependencies even when it means that executables provided by the package aren't going to work with the minimal set of dependencies. The packages could be split up more to avoid this without pulling in more stuff, but it's not what packagers usually choose to it. It's a design choice left up to the packager, not a bug.
The namcap tool reports missing libraries when packages are built with devtools so you're not going to be finding stuff that hasn't already been reported automatically.
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