Index: pkgs/development/interpreters/r-lang/default.nix
===================================================================
--- pkgs/development/interpreters/r-lang/default.nix	(revision 25607)
+++ pkgs/development/interpreters/r-lang/default.nix	(working copy)
@@ -4,20 +4,14 @@
 
 stdenv.mkDerivation {
   name = "r-lang";
-  version = "2.12.0";
+  version = "2.12.1";
   src = fetchurl {
-    url = http://cran.r-project.org/src/base/R-2/R-2.12.0.tar.gz;
-    sha256 = "93d72d845b01c6cd00e58f04b5e78fd6c83de96a8620505ad2a016772af02179";
+    url = http://cran.r-project.org/src/base/R-2/R-2.12.1.tar.gz;
+    sha256 = "74475d73f145d25c1e121dac9e4f18eaa077510b9e58d514cc6ae523382dee3f";
   };
 
   bioconductor = if withBioconductor then import ../development/libraries/science/biology/bioconductor { inherit fetchurl stdenv readline; } else null;
 
-  postUnpack = ''
-    gunzip R-2.12.0/src/library/Recommended/Matrix_0.999375-44.tar.gz
-    tar --file=R-2.12.0/src/library/Recommended/Matrix_0.999375-44.tar --delete Matrix/src/dummy.cpp
-    gzip R-2.12.0/src/library/Recommended/Matrix_0.999375-44.tar
-  '';
-
   buildInputs = [readline perl gfortran libpng libX11 libXt zlib];
   configureFlags = ["--enable-R-shlib"] ;