diff --git a/pkgs/development/compilers/gcc-4.6/builder.sh b/pkgs/development/compilers/gcc-4.6/builder.sh
index aedd5b46b121..49e4b3e4cc7d 100644
--- a/pkgs/development/compilers/gcc-4.6/builder.sh
+++ b/pkgs/development/compilers/gcc-4.6/builder.sh
@@ -201,8 +201,9 @@ postInstall() {
     rm -rf $out/bin/gccbug
     # Take out the bootstrap-tools from the rpath, as it's not needed at all having $out
     for i in $out/libexec/gcc/*/*/*; do
-        PREV_RPATH=`patchelf --print-rpath $i`
-        patchelf --set-rpath `echo $PREV_RPATH | sed 's,:[^:]*bootstrap-tools/lib,,'` $i
+        if PREV_RPATH=`patchelf --print-rpath $i`; then
+            patchelf --set-rpath `echo $PREV_RPATH | sed 's,:[^:]*bootstrap-tools/lib,,'` $i
+        fi
     done
 
     # Get rid of some "fixed" header files
diff --git a/pkgs/development/compilers/gcc-4.6/default.nix b/pkgs/development/compilers/gcc-4.6/default.nix
index 19efa57af8ee..d1b05690b568 100644
--- a/pkgs/development/compilers/gcc-4.6/default.nix
+++ b/pkgs/development/compilers/gcc-4.6/default.nix
@@ -10,7 +10,7 @@
 , perl ? null # optional, for texi2pod (then pod2man); required for Java
 , gmp, mpfr, mpc, gettext, which
 , libelf                      # optional, for link-time optimizations (LTO)
-, ppl ? null, cloogppl ? null # optional, for the Graphite optimization framework
+, ppl ? null, cloogppl ? null, cloog ? null # optional, for the Graphite optimization framework. Cannot pass both cloog and cloogppl
 , bison ? null, flex ? null
 , zlib ? null, boehmgc ? null
 , zip ? null, unzip ? null, pkgconfig ? null, gtk ? null, libart_lgpl ? null
@@ -38,10 +38,13 @@ assert langVhdl     -> gnat != null;
 # LTO needs libelf and zlib.
 assert libelf != null -> zlib != null;
 
+# Cannot use both cloog and cloog-ppl
+assert cloog != null -> cloogppl == null;
+
 with stdenv.lib;
 with builtins;
 
-let version = "4.5.1";
+let version = "4.6.0";
     javaEcj = fetchurl {
       # The `$(top_srcdir)/ecj.jar' file is automatically picked up at
       # `configure' time.
@@ -97,6 +100,7 @@ let version = "4.5.1";
         " --disable-threads " +
         " --disable-libmudflap " +
         " --disable-libgomp " +
+        " --disable-libquadmath" +
         " --disable-shared" +
         " --disable-decimal-float" # libdecnumber requires libc
         else
@@ -202,6 +206,7 @@ stdenv.mkDerivation ({
   buildInputs = [ gmp mpfr mpc libelf gettext ]
     ++ (optional (ppl != null) ppl)
     ++ (optional (cloogppl != null) cloogppl)
+    ++ (optional (cloog != null) cloog)
     ++ (optionals langTreelang [bison flex])
     ++ (optional (zlib != null) zlib)
     ++ (optional (boehmgc != null) boehmgc)
@@ -222,6 +227,9 @@ stdenv.mkDerivation ({
     ${if enableShared then "" else "--disable-shared"}
     ${if ppl != null then "--with-ppl=${ppl}" else ""}
     ${if cloogppl != null then "--with-cloog=${cloogppl}" else ""}
+    ${if cloog != null then 
+      "--with-cloog=${cloog} --enable-cloog-backend=isl" 
+      else ""}
     ${if langJava then
       "--with-ecj-jar=${javaEcj} " +
 
@@ -277,6 +285,7 @@ stdenv.mkDerivation ({
       ${if enableShared then "" else "--disable-shared"}
       ${if ppl != null then "--with-ppl=${ppl.hostDrv}" else ""}
       ${if cloogppl != null then "--with-cloog=${cloogppl.hostDrv}" else ""}
+      ${if cloog != null then "--with-cloog=${cloog.hostDrv} --enable-cloog-backend=isl" else ""}
       ${if langJava then "--with-ecj-jar=${javaEcj.hostDrv}" else ""}
       ${if javaAwtGtk then "--enable-java-awt=gtk" else ""}
       ${if langJava && javaAntlr != null then "--with-antlr-jar=${javaAntlr.hostDrv}" else ""}
diff --git a/pkgs/development/compilers/gcc-4.6/sources.nix b/pkgs/development/compilers/gcc-4.6/sources.nix
index 6059e03880b3..7d9a96863779 100644
--- a/pkgs/development/compilers/gcc-4.6/sources.nix
+++ b/pkgs/development/compilers/gcc-4.6/sources.nix
@@ -1,26 +1,26 @@
 /* Automatically generated by `update-gcc.sh', do not edit.
-   For GCC 4.5.1.  */
+   For GCC 4.6.0.  */
 { fetchurl, optional, version, langC, langCC, langFortran, langJava, langAda }:
 
-assert version == "4.5.1";
+assert version == "4.6.0";
 optional /* langC */ true (fetchurl {
   url = "mirror://gcc/releases/gcc-${version}/gcc-core-${version}.tar.bz2";
-  sha256 = "0sjjw3qfcpdk0fs5d2rhl0xqcaclg86ifbq45dbk9ca072l3fyxm";
+  sha256 = "1hfgn36hs6jpaflhirmhavwjqzwa35fjl9i661j0lwp3dmbr2c9m";
 }) ++
 optional langCC (fetchurl {
   url = "mirror://gcc/releases/gcc-${version}/gcc-g++-${version}.tar.bz2";
-  sha256 = "0j6ffb96b3r75hrjshg52llv21ax7r8jdx44hhj0maiisnl9wd55";
+  sha256 = "0ga5vdyc1n0f60gph28zc08n05kxadm77q7kg9fgsfr0vvnjzsf2";
 }) ++
 optional langFortran (fetchurl {
   url = "mirror://gcc/releases/gcc-${version}/gcc-fortran-${version}.tar.bz2";
-  sha256 = "0xgwjc3h5fc5c100bnw24c35255il33lj5qbgpxf0zl8di2q13aw";
+  sha256 = "1b09411jazcz0pq6plsmhgbb6mkz1l4d8j9p0iz56a4v5ccvn4jn";
 }) ++
 optional langJava (fetchurl {
   url = "mirror://gcc/releases/gcc-${version}/gcc-java-${version}.tar.bz2";
-  sha256 = "0mh37q4ibg05h1hdh39pkj1hycvdg6i79m4698knw7pppm14ax8q";
+  sha256 = "15y8w9lvxg33kmiwcwwyj68w0ngay1fmshcirml7z3dlgjqm7lbd";
 }) ++
 optional langAda (fetchurl {
   url = "mirror://gcc/releases/gcc-${version}/gcc-ada-${version}.tar.bz2";
-  sha256 = "11chdbl7h046lnl83k79vj7dvgxz6kq7cnmwx94z644vaiflg153";
+  sha256 = "1z207n5nxvzdfh26l5jyx13fam51hy0vwyan40jjavdh8pi1x81m";
 }) ++
 []
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index fd4a518d4e52..7df76743d53c 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1663,6 +1663,8 @@ let
 
   gcc45 = gcc45_real;
 
+  gcc46 = gcc46_real;
+
   gcc45_realCross = lib.addMetaAttrs { platforms = []; }
     (makeOverridable (import ../development/compilers/gcc-4.5) {
       inherit fetchurl stdenv texinfo gmp mpfr mpc libelf zlib
@@ -1736,6 +1738,16 @@ let
     profiledCompiler = if stdenv.system == "armv5tel-linux" then false else true;
   }));
 
+  gcc46_real = lowPrio (wrapGCC (makeOverridable (import ../development/compilers/gcc-4.6) {
+    inherit fetchurl stdenv texinfo gmp mpfr mpc libelf zlib perl
+      cloog gettext which noSysDirs;
+    ppl = callPackage ../development/libraries/ppl/0.11.nix { };
+    
+    # bootstrapping a profiled compiler does not work in the sheevaplug:
+    # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43944
+    profiledCompiler = if stdenv.system == "armv5tel-linux" then false else true;
+  }));
+
   gccApple =
     wrapGCC ( (if stdenv.system == "i686-darwin" then import ../development/compilers/gcc-apple else import ../development/compilers/gcc-apple64) {
       inherit fetchurl stdenv noSysDirs;