Remove the unused configRunHc.

cabal-install/src/Network/Hackage/CabalInstall/Configure.hs

@@ -108,12 +108,10 @@ localPrefix
 mkConfigFlags :: TempFlags -> IO ConfigFlags
 mkConfigFlags cfg
     = do let verbosity = tempVerbose cfg
-             conf = userMaybeSpecifyPath "runhaskell" (tempRunHc cfg) $
-	            userMaybeSpecifyPath "tar" (tempTarPath cfg) $
+             conf = userMaybeSpecifyPath "tar" (tempTarPath cfg) $
 	            defaultProgramConfiguration
-         (runHc, conf') <- requireProgram verbosity runhaskellProgram AnyVersion conf
-	 (tarProg, conf'') <- requireProgram verbosity tarProgram AnyVersion conf'
-         (comp, conf''') <- Configure.configCompiler (tempHcFlavor cfg) (tempHcPath cfg) (tempHcPkg cfg) conf'' verbosity
+	 (tarProg, conf') <- requireProgram verbosity tarProgram AnyVersion conf
+         (comp, conf'') <- Configure.configCompiler (tempHcFlavor cfg) (tempHcPath cfg) (tempHcPkg cfg) conf' verbosity
          let userIns = tempUserIns cfg
          prefix <- if userIns
                       then fmap Just (maybe localPrefix return (tempPrefix cfg))
@@ -130,13 +128,12 @@ mkConfigFlags cfg
          outputGen <- defaultOutputGen (tempVerbose cfg)
          let config = ConfigFlags
                       { configCompiler    = comp
-		      , configPrograms    = conf'''
+		      , configPrograms    = conf''
                       , configConfDir     = confDir
                       , configCacheDir    = cacheDir
                       , configPrefix      = prefix
                       , configServers     = []
                       , configTarPath     = programPath tarProg
-                      , configRunHc       = programPath runHc
                       , configOutputGen   = outputGen
                       , configVerbose     = tempVerbose cfg
 --                      , configUpgradeDeps = tempUpgradeDeps cfg

cabal-install/src/Network/Hackage/CabalInstall/Install.hs

@@ -113,8 +113,7 @@ installPkg cfg globalArgs (pkg,ops,repo)
                       extractTarFile tarProg tmpPkgPath
                       installUnpackedPkg cfg pkg tmpPkgPath setup
                       return ())
-    where runHc = configRunHc cfg
-          tarProg = configTarPath cfg
+    where tarProg = configTarPath cfg
           output = configOutputGen cfg
 
 installUnpackedPkg :: ConfigFlags -> PackageIdentifier -> FilePath

cabal-install/src/Network/Hackage/CabalInstall/Setup.hs

@@ -38,7 +38,6 @@ emptyTempFlags = TempFlags {
         tempCacheDir    = Nothing,
         tempHcPkg       = Nothing,
         tempPrefix      = Nothing,
-        tempRunHc       = Nothing,
         tempTarPath     = Nothing,
         tempVerbose     = normal,
 --        tempUpgradeDeps = False,

cabal-install/src/Network/Hackage/CabalInstall/Types.hs

@@ -47,7 +47,6 @@ data TempFlags = TempFlags {
         tempHcPkg       :: Maybe FilePath, -- ^given hc-pkg location
         tempPrefix      :: Maybe FilePath,
         tempTarPath     :: Maybe FilePath,
-        tempRunHc       :: Maybe FilePath,
         tempVerbose     :: Verbosity,            -- ^verbosity level
 --        tempUpgradeDeps :: Bool,
         tempUserIns     :: Bool,           -- ^--user-install flag
@@ -62,7 +61,6 @@ data ConfigFlags = ConfigFlags {
         configPrefix      :: Maybe FilePath,
         configServers     :: [Repo],       -- ^Available Hackage servers.
         configTarPath     :: FilePath,
-        configRunHc       :: FilePath,
         configOutputGen   :: OutputGen,
         configVerbose     :: Verbosity,
 --        configUpgradeDeps :: Bool,