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By default GhcThreaded is set by ``` GhcThreaded = $(if $(findstring thr,$(GhcRTSWays)),YES,NO) ``` so it seems incorrect to try to build iserv with -threaded when GhcThreaded is not set. This came up when I was building GHC with some strange combination of flavours (debugged and profiled but not threaded). Test Plan: harbormaster Reviewers: simonmar, austin, bgamari Reviewed By: bgamari Subscribers: thomie, snowleopard Differential Revision: https://phabricator.haskell.org/D3429
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