diff --git a/pkgs/development/misc/avr-gcc-with-avr-libc/avr-libc-fix-gcc-4.6.0.patch b/pkgs/development/misc/avr-gcc-with-avr-libc/avr-libc-fix-gcc-4.6.0.patch
new file mode 100644
index 00000000000..e59e40091bf
--- /dev/null
+++ b/pkgs/development/misc/avr-gcc-with-avr-libc/avr-libc-fix-gcc-4.6.0.patch
@@ -0,0 +1,29 @@
+# Patch from Gentoo
+
+diff -ur 1/include/avr/pgmspace.h 2/include/avr/pgmspace.h
+--- 1/include/avr/pgmspace.h	2011-05-31 18:19:44.524000823 +0200
++++ 2/include/avr/pgmspace.h	2011-05-31 18:20:27.576000824 +0200
+@@ -252,7 +252,7 @@
+ # define PSTR(s) ((const PROGMEM char *)(s))
+ #else  /* !DOXYGEN */
+ /* The real thing. */
+-# define PSTR(s) (__extension__({static char __c[] PROGMEM = (s); &__c[0];}))
++# define PSTR(s) (__extension__({static const char __c[] PROGMEM = (s); &__c[0];}))
+ #endif /* DOXYGEN */
+ 
+ #define __LPM_classic__(addr)   \
+diff -ur 1/libc/stdlib/dtostre.c 2/libc/stdlib/dtostre.c
+--- 1/libc/stdlib/dtostre.c	2011-05-31 18:19:44.639000823 +0200
++++ 2/libc/stdlib/dtostre.c	2011-05-31 18:20:27.639000824 +0200
+@@ -37,9 +37,9 @@
+ char *
+ dtostre (double val, char *sbeg, unsigned char prec, unsigned char flags)
+ {
+-    __attribute__((progmem)) static char str_nan[2][4] =
++    __attribute__((progmem)) static const char str_nan[2][4] =
+ 	{"nan", "NAN"};
+-    __attribute__((progmem)) static char str_inf[2][sizeof(str_nan[0])] =
++    __attribute__((progmem)) static const char str_inf[2][sizeof(str_nan[0])] =
+ 	{"inf", "INF"};
+     char *d;		/* dst	*/
+     char *s;		/* src	*/
diff --git a/pkgs/development/misc/avr-gcc-with-avr-libc/default.nix b/pkgs/development/misc/avr-gcc-with-avr-libc/default.nix
index 06063db491e..83e800faa2c 100644
--- a/pkgs/development/misc/avr-gcc-with-avr-libc/default.nix
+++ b/pkgs/development/misc/avr-gcc-with-avr-libc/default.nix
@@ -1,21 +1,23 @@
-{ stdenv, fetchurl, writeTextFile, coreutils, gnumake, gcc, gnutar, bzip2, gnugrep, gnused, gawk }:
+{ stdenv, fetchurl, writeTextFile, coreutils, gnumake, gcc, gnutar, bzip2
+  , gnugrep, gnused, gawk, diffutils, patch
+  , gmp, mpfr, mpc }:
 
 stdenv.mkDerivation {
   name = "avr-gcc-libc";
 
   srcBinutils = fetchurl {
-    url = ftp://ftp.gnu.org/gnu/binutils/binutils-2.17.tar.bz2;
-    sha256 = "0pm20n2l9ddgdpgzk3zhnbb8nbyb4rb2kvcw21pkd6iwybk3rhz2";
+    url = "mirror://gnu/binutils/binutils-2.21.tar.bz2";
+    sha256 = "1iyhc42zfa0j2gaxy4zvpk47sdqj4rqvib0mb8597ss8yidyrav0";
   };
 
   srcGCC = fetchurl {
-    url = ftp://ftp.gnu.org/gnu/gcc/gcc-4.1.2/gcc-core-4.1.2.tar.bz2;
-    sha256 = "07binc1hqlr0g387zrg5sp57i12yzd5ja2lgjb83bbh0h3gwbsbv";
+    url = "mirror://gcc/releases/gcc-4.6.1/gcc-core-4.6.1.tar.bz2";
+    sha256 = "0bbb8f754a31f29013f6e9ad4c755d92bb0f154a665c4b623e86ae7174d98e33";
   };
 
   srcAVRLibc = fetchurl {
-    url = http://www.very-clever.com/download/nongnu/avr-libc/avr-libc-1.4.5.tar.bz2;
-    sha256 = "058iv3vs6syy01pfkd5894xap9zakjx8ki1bpjdnihn6vk6fr80l";
+    url = http://download.savannah.gnu.org/releases/avr-libc/avr-libc-1.7.1.tar.bz2;
+    sha256 = "1b1s4cf787izlm3r094vvkzrzb3w3bg6bwiz2wz71cg7q07kzzn6";
   };
 
   phases = "doAll";
@@ -24,7 +26,7 @@ stdenv.mkDerivation {
   builder = writeTextFile {
     name = "avrbinutilsgccavrlibc-builder-script";
     text =  ''
-    PATH=${coreutils}/bin:${gnumake}/bin:${gcc}/bin:${gnutar}/bin:${bzip2}/bin:${gnugrep}/bin:${gnused}/bin:${gawk}/bin
+    PATH=${coreutils}/bin:${gnumake}/bin:${gcc}/bin:${gnutar}/bin:${bzip2}/bin:${gnugrep}/bin:${gnused}/bin:${gawk}/bin:${diffutils}/bin:${patch}/bin
     # that's all a bit too hacky...!
     for i in `cat ${gcc}/nix-support/propagated-user-env-packages`; do
       echo adding $i
@@ -33,6 +35,11 @@ stdenv.mkDerivation {
     mkdir -p "$out"
     export > env-vars
 
+    for i in "${gmp}" "${mpfr}" "${mpc}"; do
+      export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -I$i/include "
+      export NIX_LDFLAGS="$NIX_LDFLAGS -L$i/lib "
+    done
+
     # important, without this gcc won't find the binutils executables
     PATH=$PATH:$out/bin
 
@@ -51,13 +58,14 @@ stdenv.mkDerivation {
       cd gcc-*
       mkdir obj-avr
       cd obj-avr
-      ../configure --target=avr --prefix="$prefix" --disable-nls --enable-languages=c --disable-libssp
+      ../configure --target=avr --prefix="$prefix" --disable-nls --enable-languages=c --disable-libssp --with-dwarf2
       make $MAKE_FLAGS
       make install
 
     cd $TMP
       tar jxf $srcAVRLibc
       cd avr-libc-*
+      patch -Np1 -i ${./avr-libc-fix-gcc-4.6.0.patch}
       ./configure --prefix="$prefix" --build=`./config.guess` --host=avr
       make $MAKE_FLAGS
       make install
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index e3183fbc391..853e67dc5e8 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2598,9 +2598,7 @@ let
 
   ### DEVELOPMENT / MISC
 
-  avrgcclibc = callPackage ../development/misc/avr-gcc-with-avr-libc {
-    gcc = gcc40;
-  };
+  avrgcclibc = callPackage ../development/misc/avr-gcc-with-avr-libc {};
 
   avr8burnomat = callPackage ../development/misc/avr8-burn-omat { };