From b4586e991e5ebf294a94d7c04a877357ec71d86d Mon Sep 17 00:00:00 2001
From: Michael Snoyman <michael@snoyman.com>
Date: Fri, 23 Jan 2015 00:09:10 +0200
Subject: [PATCH] Don't die due to missing tool jgm/zip-archive#23

---
 Stackage/PerformBuild.hs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Stackage/PerformBuild.hs b/Stackage/PerformBuild.hs
index 58821125..c74b449a 100644
--- a/Stackage/PerformBuild.hs
+++ b/Stackage/PerformBuild.hs
@@ -88,7 +88,9 @@ waitForDeps toolMap packageMap activeComps bp pi action = do
             case lookup exe toolMap >>= fromNullable . map checkPackage . setToList of
                 Nothing
                     | isCoreExe exe -> return ()
-                    | otherwise -> throwSTM $ ToolMissing exe
+                    -- https://github.com/jgm/zip-archive/issues/23
+                    -- | otherwise -> throwSTM $ ToolMissing exe
+                    | otherwise -> return ()
                 Just packages -> ofoldl1' (<|>) packages
     action
   where