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24 lines
1.4 KiB
Diff
24 lines
1.4 KiB
Diff
diff --git a/Mueval/Interpreter.hs b/Mueval/Interpreter.hs
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index 29b771f..6360ee3 100644
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--- a/Mueval/Interpreter.hs
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+++ b/Mueval/Interpreter.hs
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@@ -8,6 +8,7 @@ import Control.Monad.Writer (Any(..),runWriterT,tell)
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import Data.Char (isDigit)
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import Data.List (stripPrefix)
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import System.Directory (copyFile, makeRelativeToCurrentDirectory, removeFile, setCurrentDirectory)
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+import System.Environment (lookupEnv)
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import System.Exit (exitFailure)
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import System.FilePath.Posix (takeFileName)
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import qualified Control.Exception.Extensible as E (evaluate,catch,SomeException(..))
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@@ -47,6 +48,10 @@ interpreter Options { extensions = exts, namedExtensions = nexts,
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-- Explicitly adding ImplicitPrelude because of
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-- http://darcsden.com/jcpetruzza/hint/issue/1
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unless (null lexts) $ set [languageExtensions := (UnknownExtension "ImplicitPrelude" : lexts)]
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+ pkgs' <- liftIO $ lookupEnv "NIX_GHC_LIBDIR"
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+ case pkgs' of
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+ Just pkgs -> unsafeSetGhcOption ("-package-db " ++ pkgs ++ "/package.conf.d")
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+ Nothing -> return ()
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when trust $ do
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unsafeSetGhcOption "-fpackage-trust"
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forM_ (trustPkgs >>= words) $ \pkg ->
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