Update to Haskell Platform 2012.4.0.0 RC2.

pkgs/development/libraries/haskell/haskell-platform/haskell-platform-2012.4.0.0.cabal

@@ -25,35 +25,48 @@ cabal-version:       >= 1.8
 build-type:          Custom
 tested-with:         GHC ==7.4.2
 
+flag include-ghc-depends
+  description: Include all the GHC provided packages in the dependencies
+  default:     False
+
 library
+  if flag(include-ghc-depends)
+    build-depends:
+      ghc                      ==7.4.2,
+
+      -- Core libraries: provided by every ghc installation
+      -- We don't include "non-API" packages here.
+      --                                        begin core packages
+      array                    ==0.4.0.0,
+      base                     ==4.5.1.0,
+      bytestring               ==0.9.2.1,
+      Cabal                    ==1.14.0,
+      containers               ==0.4.2.1,
+      deepseq                  ==1.3.0.0,
+      directory                ==1.1.0.2,
+      extensible-exceptions    ==0.1.1.4,
+      filepath                 ==1.3.0.0,
+      haskell2010              ==1.1.0.1,
+      haskell98                ==2.0.0.1,
+      hpc                      ==0.5.1.1,
+      old-locale               ==1.0.0.4,
+      old-time                 ==1.1.0.0,
+      pretty                   ==1.1.1.0,
+      process                  ==1.1.0.1,
+      template-haskell         ==2.7.0.0,
+      time                     ==1.4
+  if !os(windows)
+    build-depends:
+      unix                     ==2.5.1.1
+      --                                        end core packages
+  else
+    build-depends:
+      Win32                    ==2.2.2.0
+
   build-depends:
-    -- ghc                      ==7.4.2,
-
-    -- Core libraries: provided by every ghc installation
-    -- We don't include "non-API" packages here.
-    -- array                    ==0.4.0.0,
-    -- base                     ==4.5.1.0,
-    -- bytestring               ==0.9.2.1,
-    -- Cabal                    ==1.14.0,
-    -- containers               ==0.4.2.1,
-    -- deepseq                  ==1.3.0.0,
-    -- directory                ==1.1.0.2,
-    -- extensible-exceptions    ==0.1.1.4,
-    -- filepath                 ==1.3.0.0,
-    -- haskell2010              ==1.1.0.1,
-    -- haskell98                ==2.0.0.1,
-    -- hpc                      ==0.5.1.1,
-    -- old-locale               ==1.0.0.4,
-    -- old-time                 ==1.1.0.0,
-    -- pretty                   ==1.1.1.0,
-    -- process                  ==1.1.0.1,
-    -- template-haskell         ==2.7.0.0,
-    -- time                     ==1.4,
-    -- unix                     ==2.5.1.1,
-    -- Win32                    ==2.2.2.0,
-
     -- Libraries in addition to what GHC provides:
     -- Note: newer versions of cgi need monad-catchio.
+    --                                          begin platform packages
     async                       ==2.0.1.3,
     cgi                         ==3001.1.7.4,
     fgl                         ==5.4.2.4,
@@ -77,13 +90,13 @@ library
     syb                         ==0.3.7,
     text                        ==0.11.2.3,
     transformers                ==0.3.0.0,
-    vector                      ==0.10,
+    vector                      ==0.10.0.1,
     xhtml                       ==3000.2.1,
     zlib                        ==0.5.4.0,
 
     -- Libraries that are needed to support the above,
     -- though are not officially part of the platform
-    primitive                   ==0.5
+    primitive                   ==0.5.0.1
 
   -- Depending on programs does not work, they are not registered
   -- We list them to help distro packaging.
@@ -91,6 +104,10 @@ library
     cabal-install               ==0.14.0,
     alex                        ==3.0.2,
     happy                       ==1.18.10
+    --                                          end platform packages
     -- hscolour                 ==1.19   -- ???
     -- haddock                  ==2.11.0 -- need to use the one shipped with ghc
 
+-- N.B.: The begin/end comment annocations are used to build the source
+-- installer: Packages that are part of the core are checked at build time.
+-- Source of packages that are part of the platform are included in the tarball.

pkgs/top-level/haskell-packages.nix

@@ -143,7 +143,7 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
     syb          = self.syb_0_3_7;              # 7.6 ok
     text         = self.text_0_11_2_3;          # 7.6 ok
     transformers = self.transformers_0_3_0_0;   # 7.6 ok
-    vector       = self.vector_0_10;            # 7.6 ok
+    vector       = self.vector_0_10_0_1;        # 7.6 ok
     xhtml        = self.xhtml_3000_2_1;         # 7.6 ok
     zlib         = self.zlib_0_5_4_0;           # 7.6 ok
     cabalInstall = self.cabalInstall_1_16_0;    # 7.6 ok
@@ -178,14 +178,14 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
     syb          = self.syb_0_3_7;
     text         = self.text_0_11_2_3;
     transformers = self.transformers_0_3_0_0;
-    vector       = self.vector_0_10;
+    vector       = self.vector_0_10_0_1;
     xhtml        = self.xhtml_3000_2_1;
     zlib         = self.zlib_0_5_4_0;
     cabalInstall = self.cabalInstall_0_14_0;
     alex         = self.alex_3_0_2;
     haddock      = self.haddock_2_11_0;
     happy        = self.happy_1_18_10;
-    primitive    = self.primitive_0_5; # semi-official, but specified
+    primitive    = self.primitive_0_5_0_1; # semi-official, but specified
   };
 
   haskellPlatform_2012_4_0_0 =