diff --git a/pkgs/development/compilers/ghc-6.6.1/builder.sh b/pkgs/development/compilers/ghc-6.6.1/builder.sh
new file mode 100644
index 00000000000..75b97218f30
--- /dev/null
+++ b/pkgs/development/compilers/ghc-6.6.1/builder.sh
@@ -0,0 +1,21 @@
+source $stdenv/setup
+
+# Setup isolated package management
+postInstall()
+{
+    ensureDir "$out/nix-support"
+    echo "# Path to the GHC compiler directory in the store" > $out/nix-support/setup-hook
+    echo "ghc=$out" >> $out/nix-support/setup-hook
+    echo ""         >> $out/nix-support/setup-hook
+    cat $setupHook  >> $out/nix-support/setup-hook
+}
+postInstall=postInstall
+
+preConfigure()
+{
+    chmod u+x rts/gmp/configure
+}
+preConfigure=preConfigure
+
+# Standard configure/make/make install
+genericBuild
diff --git a/pkgs/development/compilers/ghc-6.6.1/default.nix b/pkgs/development/compilers/ghc-6.6.1/default.nix
new file mode 100644
index 00000000000..06f5a2f9fb8
--- /dev/null
+++ b/pkgs/development/compilers/ghc-6.6.1/default.nix
@@ -0,0 +1,24 @@
+{stdenv, fetchurl, readline, ghc, perl, m4}:
+
+stdenv.mkDerivation {
+  name = "ghc-6.6.1";
+
+  src = map fetchurl [
+    { url = http://www.haskell.org/ghc/dist/6.6.1/ghc-6.6.1-src.tar.bz2;
+      md5 = "dea271503463bd28c27f25ab90998633";
+    }
+    { url = http://www.haskell.org/ghc/dist/6.6.1/ghc-6.6.1-src-extralibs.tar.bz2;
+      md5 = "43a26b81608b206c056adc3032f7da2a";
+    }
+  ];
+
+  builder = ./builder.sh;
+
+  buildInputs = [ghc readline perl m4];
+
+  setupHook = ./setup-hook.sh;
+
+  meta = {
+    description = "The Glasgow Haskell Compiler v6.6.1";
+  };
+}
diff --git a/pkgs/development/compilers/ghc-6.6.1/setup-hook.sh b/pkgs/development/compilers/ghc-6.6.1/setup-hook.sh
new file mode 100644
index 00000000000..23da6de0382
--- /dev/null
+++ b/pkgs/development/compilers/ghc-6.6.1/setup-hook.sh
@@ -0,0 +1,41 @@
+# Support dir for isolating GHC
+ghc_support=$TMPDIR/ghc-6.6-nix-support
+mkdir -p $ghc_support
+
+# Create isolated package config
+packages_db=$ghc_support/package.conf
+cp $ghc/lib/ghc-*/package.conf $packages_db
+chmod +w $packages_db
+
+# Generate wrappers for GHC that use the isolated package config
+makeWrapper() {
+  wrapperName="$1"
+  wrapper="$ghc_support/$wrapperName"
+  shift #the other arguments are passed to the source app
+  echo '#!'"$SHELL" > "$wrapper"
+  echo "exec \"$ghc/bin/$wrapperName\" $@" '"$@"' > "$wrapper"
+  chmod +x "$wrapper"
+}
+
+makeWrapper "ghc"         "-no-user-package-conf -package-conf $packages_db"
+makeWrapper "ghci"        "-no-user-package-conf -package-conf $packages_db"
+makeWrapper "runghc"      "-no-user-package-conf -package-conf $packages_db"
+makeWrapper "runhaskell"  "-no-user-package-conf -package-conf $packages_db"
+makeWrapper "ghc-pkg"     "--global-conf $packages_db"
+
+# Add wrappers to search path
+export _PATH=$ghc_support:$_PATH
+
+# Env hook to add packages to the package config
+addLibToPackageConf ()
+{
+    local regscript=$1/nix-support/register-ghclib.sh
+    if test -f $regscript; then
+        local oldpath=$PATH
+        export PATH=$ghc_support:$PATH
+        sh $regscript $package_db
+        export PATH=$oldpath
+    fi
+}
+
+envHooks=(${envHooks[@]} addLibToPackageConf)
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index f30fe2aecf9..3d9eb111c18 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -690,6 +690,12 @@ rec {
 
   ghc = ghc66;
 
+  ghc661 = import ../development/compilers/ghc-6.6.1 {
+    inherit fetchurl stdenv readline perl;
+    m4 = gnum4;
+    ghc = ghcboot;
+  };
+
   ghc66 = import ../development/compilers/ghc-6.6 {
     inherit fetchurl stdenv readline perl;
     m4 = gnum4;