diff --git a/pkgs/development/compilers/pakcs/adjust-buildsystem.patch b/pkgs/development/compilers/pakcs/adjust-buildsystem.patch
index 4de7683dcdd3..830fc3fa7f9a 100644
--- a/pkgs/development/compilers/pakcs/adjust-buildsystem.patch
+++ b/pkgs/development/compilers/pakcs/adjust-buildsystem.patch
@@ -1,7 +1,7 @@
-diff -Naur pakcs-1.11.2-upstream/Makefile pakcs-1.11.2/Makefile
---- pakcs-1.11.2-upstream/Makefile	2013-03-21 04:58:38.000000000 -0430
-+++ pakcs-1.11.2/Makefile	2013-05-09 15:04:48.035646127 -0430
-@@ -55,7 +55,6 @@
+diff -Naur pakcs-1.11.3-upstream/Makefile pakcs-1.11.3/Makefile
+--- pakcs-1.11.3-upstream/Makefile	2014-01-31 09:10:03.000000000 -0430
++++ pakcs-1.11.3/Makefile	2014-02-03 20:27:41.558334480 -0430
+@@ -66,7 +66,6 @@
  #
  .PHONY: install
  install: installscripts
@@ -9,21 +9,20 @@ diff -Naur pakcs-1.11.2-upstream/Makefile pakcs-1.11.2/Makefile
  	# pre-compile all libraries:
  	@cd lib && $(MAKE) fcy
  	# install the Curry2Prolog compiler as a saved system:
-@@ -66,11 +65,6 @@
- 	@cd lib && $(MAKE) acy
- 	# prepare for separate compilation by compiling all librariers to Prolog code:
- 	@if [ -r bin/pakcs ] ; then cd lib && $(MAKE) pl ; fi
+@@ -105,10 +104,6 @@
+ # compile the tools:
+ .PHONY: tools
+ tools:
 -	# compile the Curry Port Name Server demon:
--	@if [ -r bin/pakcs ] ; then cd cpns && $(MAKE) ; fi
+-	@if [ -r bin/pakcs ] ; then cd cpns       && $(MAKE) ; fi
 -	# compile the event handler demon for dynamic web pages:
--	@if [ -r bin/pakcs ] ; then cd www && $(MAKE) ; fi
--	$(MAKE) tools
- 	$(MAKE) docs
- 	chmod -R go+rX .
+-	@if [ -r bin/pakcs ] ; then cd www        && $(MAKE) ; fi
+ 	@if [ -r bin/pakcs ] ; then cd currytools && $(MAKE) ; fi
+ 	@if [ -r bin/pakcs ] ; then cd tools      && $(MAKE) ; fi
  
-diff -Naur pakcs-1.11.2-upstream/scripts/pakcs.sh pakcs-1.11.2/scripts/pakcs.sh
---- pakcs-1.11.2-upstream/scripts/pakcs.sh	2013-03-21 04:52:59.000000000 -0430
-+++ pakcs-1.11.2/scripts/pakcs.sh	2013-05-09 03:14:23.500876628 -0430
+diff -Naur pakcs-1.11.3-upstream/scripts/pakcs.sh pakcs-1.11.3/scripts/pakcs.sh
+--- pakcs-1.11.3-upstream/scripts/pakcs.sh	2014-01-31 09:04:19.000000000 -0430
++++ pakcs-1.11.3/scripts/pakcs.sh	2014-02-03 20:20:40.775350116 -0430
 @@ -16,7 +16,7 @@
  # use readline wrapper rlwrap if it is installed and we have tty as stdin:
  USERLWRAP=no
diff --git a/pkgs/development/compilers/pakcs/default.nix b/pkgs/development/compilers/pakcs/default.nix
index bb4657d8afff..a3b80c02545b 100644
--- a/pkgs/development/compilers/pakcs/default.nix
+++ b/pkgs/development/compilers/pakcs/default.nix
@@ -1,11 +1,12 @@
-{ stdenv, fetchurl, cabal, swiProlog, mtl, syb, makeWrapper, rlwrap, tk }:
+{ stdenv, fetchurl, cabal, swiProlog, either, mtl, syb
+, glibcLocales, makeWrapper, rlwrap, tk }:
 
 let
-  fname = "pakcs-1.11.2";
+  fname = "pakcs-1.11.3";
 
   fsrc = fetchurl {
     url = "http://www.informatik.uni-kiel.de/~pakcs/download/${fname}-src.tar.gz";
-    sha256 = "1x23kn91v44my4rd8j3247pj8i2myz82rzgbq07asi1x21bpvvmy";
+    sha256 = "006bq6cmycq2f4xb3zmnmxyngj64hppk3a083hy0qzj7gl77zvfw";
   };
 
 in
@@ -29,12 +30,12 @@ stdenv.mkDerivation rec {
     sourceRoot = "${name}/frontend/curry-frontend";
     isLibrary = true;
     isExecutable = true;
-    buildDepends = [ mtl syb curryBase ];
+    buildDepends = [ either mtl syb curryBase ];
   });
 
   src = fsrc;
 
-  buildInputs = [ swiProlog makeWrapper rlwrap tk ];
+  buildInputs = [ swiProlog makeWrapper glibcLocales rlwrap tk ];
 
   patches = [ ./adjust-buildsystem.patch ];
 
@@ -48,6 +49,10 @@ stdenv.mkDerivation rec {
   '';
 
   preBuild = ''
+    # Some comments in files are in UTF-8, so include the locale needed by GHC runtime.
+    export LOCALE_ARCHIVE=${glibcLocales}/lib/locale/locale-archive
+    export LC_ALL=en_US.UTF-8
+
     # Set up link to cymake, which has been built already.
     ensureDir bin/.local
     ln -s ${curryFront}/bin/cymake bin/.local/
@@ -65,10 +70,6 @@ stdenv.mkDerivation rec {
     # Fixing PAKCSHOME and related paths.
     sed -i 's@PAKCSHOME=/tmp/.*@PAKCSHOME='$out/pakcs'@' $out/pakcs/bin/{pakcs,makecurrycgi,parsecurry,.makesavedstate}
 
-    # Fix symbolic links into the tmp build dir.
-    ln -s ../currytools/CASS/cass $out/pakcs/bin/cass
-    ln -s ../currytools/currydoc/CurryDoc $out/pakcs/bin/currydoc
-
     # The Prolog sources must be rebuilt in their final directory,
     # to switch the embedded references to the tmp build directory.
     export TEMP=/tmp