diff --git a/pkgs/applications/version-management/darcs/darcs-2.nix b/pkgs/applications/version-management/darcs/darcs-2.nix
index 3de6bbfeea74..216f2c835808 100644
--- a/pkgs/applications/version-management/darcs/darcs-2.nix
+++ b/pkgs/applications/version-management/darcs/darcs-2.nix
@@ -1,10 +1,12 @@
-{cabal /* , ghc, zlib, ncurses, curl, perl */}:
+{cabal, html, mtl, parsec, regexCompat, zlib, curl} : /* , ghc, zlib, ncurses, curl, perl */
 
 cabal.mkDerivation (self : {
   pname = "darcs";
+  name = self.fname;
   version = "2.2.1";
   sha256 = "0iy4d4qls6yhwmgv87pz4kmr5jh4bwigz1wfwzns71b68csynnsp";
 
+  extraBuildInputs = [html mtl parsec regexCompat zlib curl];
   #buildInputs = [ghc zlib ncurses curl perl];
 
   #NIX_LDFLAGS = "-lz";
diff --git a/pkgs/development/compilers/ghc/setup-hook.sh b/pkgs/development/compilers/ghc/setup-hook.sh
index 5027d6536f1f..11ad50a0c796 100644
--- a/pkgs/development/compilers/ghc/setup-hook.sh
+++ b/pkgs/development/compilers/ghc/setup-hook.sh
@@ -10,7 +10,7 @@ addLibToPackageConf () {
     local fn
     shopt -s nullglob
     for fn in $1/lib/ghc-pkgs/ghc-@ghcVersion@/*.conf; do
-        @ghc@/bin/ghc-pkg register $fn
+        @ghc@/bin/ghc-pkg register --force $fn
     done
 }
 
diff --git a/pkgs/development/libraries/haskell/html/default.nix b/pkgs/development/libraries/haskell/html/default.nix
new file mode 100644
index 000000000000..52c29e74e0b4
--- /dev/null
+++ b/pkgs/development/libraries/haskell/html/default.nix
@@ -0,0 +1,11 @@
+{cabal}:
+
+cabal.mkDerivation (self : {
+  pname = "html";
+  version = "1.0.1.2";
+  sha256 = "0c35495ea33d65e69c69bc7441ec8e1af69fbb43433c2aa3406c0a13a3ab3061";
+  meta = {
+    description = "HTML combinator library";
+  };
+})  
+
diff --git a/pkgs/development/libraries/haskell/mtl/default.nix b/pkgs/development/libraries/haskell/mtl/default.nix
new file mode 100644
index 000000000000..c195d5cd7c3e
--- /dev/null
+++ b/pkgs/development/libraries/haskell/mtl/default.nix
@@ -0,0 +1,11 @@
+{cabal}:
+
+cabal.mkDerivation (self : {
+  pname = "mtl";
+  version = "1.1.0.2";
+  sha256 = "a225aaf2b1e337f40c31e5c42f95eec9a4608322b0e4c135d2b31b8421a58d36";
+  meta = {
+    description = "Monad transformer library";
+  };
+})  
+
diff --git a/pkgs/development/libraries/haskell/parsec/default.nix b/pkgs/development/libraries/haskell/parsec/default.nix
new file mode 100644
index 000000000000..6b1d9ef2e3ba
--- /dev/null
+++ b/pkgs/development/libraries/haskell/parsec/default.nix
@@ -0,0 +1,11 @@
+{cabal}:
+
+cabal.mkDerivation (self : {
+  pname = "parsec";
+  version = "2.1.0.1";
+  sha256 = "2d85e5b5c8b2b1f341037ce67e1db7fa47b31c083136796cfef9e5b945c656df";
+  meta = {
+    description = "Monadic parser combinators";
+  };
+})  
+
diff --git a/pkgs/development/libraries/haskell/regex-base/default.nix b/pkgs/development/libraries/haskell/regex-base/default.nix
new file mode 100644
index 000000000000..b82729057e7d
--- /dev/null
+++ b/pkgs/development/libraries/haskell/regex-base/default.nix
@@ -0,0 +1,12 @@
+{cabal, mtl}:
+
+cabal.mkDerivation (self : {
+  pname = "regex-base";
+  version = "0.93.1";
+  sha256 = "24a0e76ab308517a53d2525e18744d9058835626ed4005599ecd8dd4e07f3bef";
+  propagatedBuildInputs = [mtl];
+  meta = {
+    description = "Replaces/Ehances Text.Regex";
+  };
+})  
+
diff --git a/pkgs/development/libraries/haskell/regex-compat/default.nix b/pkgs/development/libraries/haskell/regex-compat/default.nix
new file mode 100644
index 000000000000..43c715d91854
--- /dev/null
+++ b/pkgs/development/libraries/haskell/regex-compat/default.nix
@@ -0,0 +1,12 @@
+{cabal, regexBase, regexPosix}:
+
+cabal.mkDerivation (self : {
+  pname = "regex-compat";
+  version = "0.92";
+  sha256 = "430d251bd704071fca1e38c9b250543f00d4e370382ed552ac3d7407d4f27936";
+  propagatedBuildInputs = [regexBase regexPosix];
+  meta = {
+    description = "Replaces/Ehances Text.Regex";
+  };
+})  
+
diff --git a/pkgs/development/libraries/haskell/regex-posix/default.nix b/pkgs/development/libraries/haskell/regex-posix/default.nix
new file mode 100644
index 000000000000..3ee1f48d25aa
--- /dev/null
+++ b/pkgs/development/libraries/haskell/regex-posix/default.nix
@@ -0,0 +1,12 @@
+{cabal, regexBase}:
+
+cabal.mkDerivation (self : {
+  pname = "regex-posix";
+  version = "0.94.1";
+  sha256 = "63e76de0610d35f1b576ae65a25a38e04e758ed64b9b3512de95bdffd649485c";
+  extraBuildInputs = [regexBase];
+  meta = {
+    description = "Replaces/Ehances Text.Regex";
+  };
+})  
+
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 5619be1a6b78..dded9bf3bec7 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -79,15 +79,39 @@ rec {
     inherit (pkgs) sqlite;
   };
 
+  html = import ../development/libraries/haskell/html {
+    inherit cabal;
+  };
+
   monadlab = import ../development/libraries/haskell/monadlab {
     inherit cabal;
   };
 
+  mtl = import ../development/libraries/haskell/mtl {
+    inherit cabal;
+  };
+
+  parsec = import ../development/libraries/haskell/parsec {
+    inherit cabal;
+  };
+
   pcreLight = import ../development/libraries/haskell/pcre-light {
     inherit cabal;
     inherit (pkgs) pcre;
   };
 
+  regexBase = import ../development/libraries/haskell/regex-base {
+    inherit cabal mtl;
+  };
+
+  regexCompat = import ../development/libraries/haskell/regex-compat {
+    inherit cabal regexBase regexPosix;
+  };
+
+  regexPosix = import ../development/libraries/haskell/regex-posix {
+    inherit cabal regexBase;
+  };
+
   uuagc = import ../development/tools/haskell/uuagc {
     inherit cabal uulib;
   };
@@ -101,16 +125,20 @@ rec {
     inherit (pkgs) stdenv fetchurl unzip wxGTK;
   };
 
-  X11 = import ../development/libraries/haskell/X11 {
+  unix = import ../development/libraries/haskell/unix {
     inherit cabal;
-    inherit (pkgs.xlibs) libX11 libXinerama libXext;
-    xineramaSupport = true;
   };
 
   vty = import ../development/libraries/haskell/vty {
     inherit cabal;
   };
 
+  X11 = import ../development/libraries/haskell/X11 {
+    inherit cabal;
+    inherit (pkgs.xlibs) libX11 libXinerama libXext;
+    xineramaSupport = true;
+  };
+
   zlib = import ../development/libraries/haskell/zlib {
     inherit cabal zlib;
   };
@@ -150,7 +178,8 @@ rec {
   # Applications.
 
   darcs = import ../applications/version-management/darcs/darcs-2.nix {
-    inherit cabal;
+    inherit cabal html mtl parsec regexCompat;
+    inherit (pkgs) zlib curl;
   };
 
   xmobar = import ../applications/misc/xmobar {