diff --git a/pkgs/development/compilers/ghc/7.4.2.nix b/pkgs/development/compilers/ghc/7.4.2.nix
new file mode 100644
index 000000000000..567e6c75def5
--- /dev/null
+++ b/pkgs/development/compilers/ghc/7.4.2.nix
@@ -0,0 +1,45 @@
+{stdenv, fetchurl, ghc, perl, gmp, ncurses, darwinInstallNameToolUtility}:
+
+stdenv.mkDerivation rec {
+  version = "7.4.1.20120412";
+
+  name = "ghc-${version}";
+
+  src = fetchurl {
+    url = "http://haskell.org/ghc/dist/stable/dist/${name}-src.tar.bz2";
+    sha256 = "0hpzd51s5nvlsjk3wza45ji5v6m0szqjzch45fvv7wfzllrm595l";
+  };
+
+  buildInputs = [ghc perl gmp ncurses] ++
+    (if stdenv.isDarwin then [darwinInstallNameToolUtility] else []);
+
+  buildMK = ''
+    libraries/integer-gmp_CONFIGURE_OPTS += --configure-option=--with-gmp-libraries="${gmp}/lib"
+    libraries/integer-gmp_CONFIGURE_OPTS += --configure-option=--with-gmp-includes="${gmp}/include"
+  '';
+
+  preConfigure = ''
+    echo "${buildMK}" > mk/build.mk
+    sed -i -e 's|-isysroot /Developer/SDKs/MacOSX10.5.sdk||' configure
+  '';
+
+  configureFlags=[
+    "--with-gcc=${stdenv.gcc}/bin/gcc"
+  ];
+
+  # required, because otherwise all symbols from HSffi.o are stripped, and
+  # that in turn causes GHCi to abort
+  stripDebugFlags=["-S" "--keep-file-symbols"];
+
+  meta = {
+    homepage = "http://haskell.org/ghc";
+    description = "The Glasgow Haskell Compiler";
+    maintainers = [
+      stdenv.lib.maintainers.marcweber
+      stdenv.lib.maintainers.andres
+      stdenv.lib.maintainers.simons
+    ];
+    platforms = ghc.meta.platforms;
+  };
+
+}
diff --git a/pkgs/development/compilers/ghc/head.nix b/pkgs/development/compilers/ghc/head.nix
index 0a08cc3a4e70..8d495a092c16 100644
--- a/pkgs/development/compilers/ghc/head.nix
+++ b/pkgs/development/compilers/ghc/head.nix
@@ -1,13 +1,13 @@
 {stdenv, fetchurl, ghc, perl, gmp, ncurses, darwinInstallNameToolUtility}:
 
 stdenv.mkDerivation rec {
-  version = "7.4.0.20120126";
+  version = "7.5.20120413";
 
   name = "ghc-${version}";
 
   src = fetchurl {
-    url = "http://haskell.org/ghc/dist/7.4.1-rc2/${name}-src.tar.bz2";
-    sha256 = "0arnvzhwjzk2z3m2891b4z13p4v1c84f31jgyj13a1fbfpylgs64";
+    url = "http://haskell.org/ghc/dist/current/dist/${name}-src.tar.bz2";
+    sha256 = "0mvpdibdvbanpia8lngrw6pinn1jm867mjcz55zj5nv8wqhgfs7r";
   };
 
   buildInputs = [ghc perl gmp ncurses] ++
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index f7f2438208a5..c80694ff6ef9 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2307,12 +2307,19 @@ let
         (if stdenv.isDarwin then ghc704Binary else ghc6121Binary)
         (x : x.ghc741Prefs) false false lowPrio);
 
+  # Stable branch snapshot.
+  haskellPackages_ghc742 =
+    recurseIntoAttrs
+      (haskellPackagesFun ../development/compilers/ghc/7.4.2.nix
+        (if stdenv.isDarwin then ghc704Binary else ghc6121Binary)
+        (x : x.ghcHEADPrefs) false false lowPrio);
+
   # Reasonably current HEAD snapshot. Should *always* be lowPrio.
   haskellPackages_ghcHEAD =
     recurseIntoAttrs
       (haskellPackagesFun ../development/compilers/ghc/head.nix
         # (haskellPackages_ghc704.ghcWithPackages (self : [ self.alex self.happy ]))
-        (if stdenv.isDarwin then ghc704Binary else ghc6121Binary)
+        ghc704Binary
         (x : x.ghcHEADPrefs) false false lowPrio);
 
   haxeDist = import ../development/compilers/haxe {