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In Hadrian, building programs (e.g. `ghc` or `haddock`) requires libraries located in the ghc-pkg package database i.e. _build/stage1/lib/x86_64-linux-ghc-8.9.0.20190430/libHSdeepseq-1.4.4.0-ghc8.9.0.20190430.so Add the corresponding `need`s for these library files and the subsequent rules.
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