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Previously we didn't specify the prog-not-found value passed to AC_CHECK_TOOLS. Reported by @snowleopard in https://github.com/snowleopard/hadrian/issues/415. Test Plan: validate Reviewers: austin, hvr Subscribers: rwbarton, thomie, snowleopard, erikd Differential Revision: https://phabricator.haskell.org/D3992
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