Use System.Process instead of System.Cmd.

System.Cmd is deprecated in process-1.2.

Cabal/Cabal.cabal

@@ -122,7 +122,7 @@ library
     deepseq    >= 1.3 && < 1.4,
     filepath   >= 1   && < 1.4,
     directory  >= 1   && < 1.3,
-    process    >= 1   && < 1.3,
+    process    >= 1.0.1.1 && < 1.3,
     time       >= 1.1 && < 1.5,
     containers >= 0.1 && < 0.6,
     array      >= 0.1 && < 0.5,

Cabal/Distribution/Simple/Utils.hs

@@ -159,8 +159,6 @@ import System.Directory
     , doesDirectoryExist, doesFileExist, removeFile, findExecutable )
 import System.Environment
     ( getProgName )
-import System.Cmd
-    ( rawSystem )
 import System.Exit
     ( exitWith, ExitCode(..) )
 import System.FilePath
@@ -192,7 +190,7 @@ import Distribution.Version
     (Version(..))
 
 import Control.Exception (IOException, evaluate, throwIO)
-import System.Process (runProcess)
+import System.Process (rawSystem, runProcess)
 
 import Control.Concurrent (forkIO)
 import System.Process (runInteractiveProcess, waitForProcess)

cabal-install/cabal-install.cabal

@@ -123,7 +123,7 @@ executable cabal
         mtl        >= 2.0      && < 3,
         network    >= 1        && < 3,
         pretty     >= 1        && < 1.2,
-        process    >= 1        && < 1.3,
+        process    >= 1.0.1.1  && < 1.3,
         random     >= 1        && < 1.1,
         stm        >= 2.0      && < 3,
         time       >= 1.1      && < 1.5,