still can't express custom-setup deps

They need unix on non-windows, for Utility.Env, which Build.Configure uses,
but cabal can't express that in a custom-setup stanza.

To avoid this problem, Utility.Env would need to be moved into
unix-compat..

Utility/Env.hs

@@ -16,6 +16,7 @@ import Control.Applicative
 import Data.Maybe
 import Prelude
 import qualified System.Environment as E
+import qualified System.SetEnv
 #else
 import qualified System.Posix.Env as PE
 #endif
@@ -41,6 +42,29 @@ getEnvironment = PE.getEnvironment
 getEnvironment = E.getEnvironment
 #endif
 
+{- Sets an environment variable. To overwrite an existing variable,
+ - overwrite must be True.
+ -
+ - On Windows, setting a variable to "" unsets it. -}
+setEnv :: String -> String -> Bool -> IO ()
+#ifndef mingw32_HOST_OS
+setEnv var val overwrite = PE.setEnv var val overwrite
+#else
+setEnv var val True = System.SetEnv.setEnv var val
+setEnv var val False = do
+	r <- getEnv var
+	case r of
+		Nothing -> setEnv var val True
+		Just _ -> return ()
+#endif
+
+unsetEnv :: String -> IO ()
+#ifndef mingw32_HOST_OS
+unsetEnv = PE.unsetEnv
+#else
+unsetEnv = System.SetEnv.unsetEnv
+#endif
+
 {- Adds the environment variable to the input environment. If already
  - present in the list, removes the old value.
  -

Utility/Env/Set.hs

@@ -1,40 +0,0 @@
-{- portable environment variables
- -
- - Copyright 2013 Joey Hess <id@joeyh.name>
- -
- - License: BSD-2-clause
- -}
-
-{-# LANGUAGE CPP #-}
-
-module Utility.Env.Set where
-
-#ifdef mingw32_HOST_OS
-import qualified System.Environment as E
-import qualified System.SetEnv
-#else
-import qualified System.Posix.Env as PE
-#endif
-
-{- Sets an environment variable. To overwrite an existing variable,
- - overwrite must be True.
- -
- - On Windows, setting a variable to "" unsets it. -}
-setEnv :: String -> String -> Bool -> IO ()
-#ifndef mingw32_HOST_OS
-setEnv var val overwrite = PE.setEnv var val overwrite
-#else
-setEnv var val True = System.SetEnv.setEnv var val
-setEnv var val False = do
-	r <- getEnv var
-	case r of
-		Nothing -> setEnv var val True
-		Just _ -> return ()
-#endif
-
-unsetEnv :: String -> IO ()
-#ifndef mingw32_HOST_OS
-unsetEnv = PE.unsetEnv
-#else
-unsetEnv = System.SetEnv.unsetEnv
-#endif

Utility/Gpg.hs

@@ -15,7 +15,6 @@ import qualified Build.SysConfig as SysConfig
 import System.Posix.Types
 import qualified System.Posix.IO
 import Utility.Env
-import Utility.Env.Set
 #endif
 import Utility.Tmp
 import Utility.Format (decode_c)

Utility/Lsof.hs

@@ -11,7 +11,7 @@ module Utility.Lsof where
 
 import Common
 import Build.SysConfig as SysConfig
-import Utility.Env.Set
+import Utility.Env
 
 import System.Posix.Types