diff --git a/pkgs/development/compilers/gcc/4.6/default.nix b/pkgs/development/compilers/gcc/4.6/default.nix
index d630f5562c57..b31f06514628 100644
--- a/pkgs/development/compilers/gcc/4.6/default.nix
+++ b/pkgs/development/compilers/gcc/4.6/default.nix
@@ -43,6 +43,16 @@ with stdenv.lib;
 with builtins;
 
 let version = "4.6.3";
+
+    patches = [ ]
+      ++ optional (cross != null) ./libstdc++-target.patch
+      ++ optional noSysDirs ./no-sys-dirs.patch
+      # The GNAT Makefiles did not pay attention to CFLAGS_FOR_TARGET for its
+      # target libraries and tools.
+      ++ optional langAda ./gnat-cflags.patch
+      ++ optional langVhdl ./ghdl-ortho-cflags.patch
+      ++ optional stdenv.isGNU ./hurd-sigrtmin.patch;
+
     javaEcj = fetchurl {
       # The `$(top_srcdir)/ecj.jar' file is automatically picked up at
       # `configure' time.
@@ -137,15 +147,7 @@ stdenv.mkDerivation ({
     inherit langC langCC langFortran langJava langAda langGo;
   };
 
-  patches =
-    [ ]
-    ++ optional (cross != null) ./libstdc++-target.patch
-    ++ optional noSysDirs ./no-sys-dirs.patch
-    # The GNAT Makefiles did not pay attention to CFLAGS_FOR_TARGET for its
-    # target libraries and tools.
-    ++ optional langAda ./gnat-cflags.patch
-    ++ optional langVhdl ./ghdl-ortho-cflags.patch
-    ;
+  inherit patches;
 
   postPatch =
     if (stdenv.system == "i586-pc-gnu"
@@ -278,6 +280,7 @@ stdenv.mkDerivation ({
     else "install";
 
   crossAttrs = {
+    patches = patches ++ [ ./hurd-sigrtmin.patch ];
     AR = "${stdenv.cross.config}-ar";
     LD = "${stdenv.cross.config}-ld";
     CC = "${stdenv.cross.config}-gcc";
diff --git a/pkgs/development/compilers/gcc/4.6/hurd-sigrtmin.patch b/pkgs/development/compilers/gcc/4.6/hurd-sigrtmin.patch
new file mode 100644
index 000000000000..dc8236d2b99f
--- /dev/null
+++ b/pkgs/development/compilers/gcc/4.6/hurd-sigrtmin.patch
@@ -0,0 +1,14 @@
+GNU libc on GNU/Hurd doesn't define `__SIGRTMIN'.
+From <http://patch-tracker.debian.org/patch/series/view/gcc-4.6/4.6.3-1/hurd-fixes.diff>.
+
+--- a/libgcc/generic-morestack.c	2011-12-19 21:14:52.000000000 +0100
++++ b/libgcc/generic-morestack.c	2011-12-19 21:15:35.000000000 +0100
+@@ -507,7 +507,7 @@
+   sigemptyset (&__morestack_initial_sp.mask);
+ 
+   sigfillset (&__morestack_fullmask);
+-#ifdef __GLIBC__
++#if defined(__GLIBC__) && defined(__SIGRTMIN)
+   /* In glibc, the first two real time signals are used by the NPTL
+      threading library.  By taking them out of the set of signals, we
+      avoiding copying the signal mask in pthread_sigmask.  More