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diff --git a/GHC/Paths.hs b/GHC/Paths.hs
index c87565d..88b3db4 100644
--- a/GHC/Paths.hs
+++ b/GHC/Paths.hs
@@ -1,13 +1,35 @@
{-# LANGUAGE CPP #-}
+{-# LANGUAGE ScopedTypeVariables #-}
module GHC.Paths (
ghc, ghc_pkg, libdir, docdir
) where
+import Control.Exception as E
+import Data.Maybe
+import System.Environment
+import System.IO.Unsafe
+
+-- Yes, there's lookupEnv now, but we want to be compatible
+-- with older GHCs.
+checkEnv :: String -> IO (Maybe String)
+checkEnv var = E.catch (fmap Just (getEnv var))
+ (\ (e :: IOException) -> return Nothing)
+
+nixLibdir, nixDocdir, nixGhc, nixGhcPkg :: Maybe FilePath
+nixLibdir = unsafePerformIO (checkEnv "NIX_GHCJS_LIBDIR")
+nixDocdir = unsafePerformIO (checkEnv "NIX_GHCJS_DOCDIR")
+nixGhc = unsafePerformIO (checkEnv "NIX_GHCJS")
+nixGhcPkg = unsafePerformIO (checkEnv "NIX_GHCJSPKG")
+{-# NOINLINE nixLibdir #-}
+{-# NOINLINE nixDocdir #-}
+{-# NOINLINE nixGhc #-}
+{-# NOINLINE nixGhcPkg #-}
+
libdir, docdir, ghc, ghc_pkg :: FilePath
-libdir = GHC_PATHS_LIBDIR
-docdir = GHC_PATHS_DOCDIR
+libdir = fromMaybe GHC_PATHS_LIBDIR nixLibdir
+docdir = fromMaybe GHC_PATHS_DOCDIR nixDocdir
-ghc = GHC_PATHS_GHC
-ghc_pkg = GHC_PATHS_GHC_PKG
+ghc = fromMaybe GHC_PATHS_GHC nixGhc
+ghc_pkg = fromMaybe GHC_PATHS_GHC_PKG nixGhcPkg
diff --git a/Setup.hs b/Setup.hs
index f2d1733..ca4792e 100644
--- a/Setup.hs
+++ b/Setup.hs
@@ -39,13 +39,13 @@ main = defaultMainWithHooks simpleUserHooks {
#else
libdir_ <- rawSystemProgramStdoutConf (fromFlag (configVerbosity flags))
#endif
- ghcProgram (withPrograms lbi) ["--print-libdir"]
+ ghcjsProgram (withPrograms lbi) ["--print-libdir"]
let libdir = reverse $ dropWhile isSpace $ reverse libdir_
- ghc_pkg = case lookupProgram ghcPkgProgram (withPrograms lbi) of
+ ghc_pkg = case lookupProgram ghcjsPkgProgram (withPrograms lbi) of
Just p -> programPath p
Nothing -> error "ghc-pkg was not found"
- ghc = case lookupProgram ghcProgram (withPrograms lbi) of
+ ghc = case lookupProgram ghcjsProgram (withPrograms lbi) of
Just p -> programPath p
Nothing -> error "ghc was not found"
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