diff --git a/pkgs/development/compilers/gcc/4.6/builder.sh b/pkgs/development/compilers/gcc/4.6/builder.sh
index bdf15be5a99..e3f185296a0 100644
--- a/pkgs/development/compilers/gcc/4.6/builder.sh
+++ b/pkgs/development/compilers/gcc/4.6/builder.sh
@@ -29,7 +29,7 @@ if test "$noSysDirs" = "1"; then
         # Use *real* header files, otherwise a limits.h is generated
         # that does not include Glibc's limits.h (notably missing
         # SSIZE_MAX, which breaks the build).
-        export NIX_FIXINC_DUMMY=$(cat $NIX_GCC/nix-support/orig-libc)/include
+        export NIX_FIXINC_DUMMY=$libc_dev/include
 
         # The path to the Glibc binaries such as `crti.o'.
         glibc_libdir="$(cat $NIX_GCC/nix-support/orig-libc)/lib"
@@ -170,9 +170,8 @@ preConfigure() {
         # Patch the configure script so it finds glibc headers.  It's
         # important for example in order not to get libssp built,
         # because its functionality is in glibc already.
-        glibc_headers="$(cat $NIX_GCC/nix-support/orig-libc)/include"
         sed -i \
-            -e "s,glibc_header_dir=/usr/include,glibc_header_dir=$glibc_headers", \
+            -e "s,glibc_header_dir=/usr/include,glibc_header_dir=$libc_dev/include", \
             gcc/configure
     fi
 
diff --git a/pkgs/development/compilers/gcc/4.6/default.nix b/pkgs/development/compilers/gcc/4.6/default.nix
index 6713dd12b3c..af6e9ab0ee1 100644
--- a/pkgs/development/compilers/gcc/4.6/default.nix
+++ b/pkgs/development/compilers/gcc/4.6/default.nix
@@ -175,7 +175,7 @@ let version = "4.6.3";
       "-stage-final";
     crossNameAddon = if cross != null then "-${cross.config}" + stageNameAddon else "";
 
-  bootstrap = cross == null && !stdenv.isArm && !stdenv.isMips;
+    bootstrap = cross == null && !stdenv.isArm && !stdenv.isMips;
 
 in
 
@@ -187,13 +187,15 @@ stdenv.mkDerivation ({
 
   builder = ./builder.sh;
 
-  src = (import ./sources.nix) {
+  srcs = (import ./sources.nix) {
     inherit fetchurl optional version;
     inherit langC langCC langFortran langJava langAda langGo;
   };
 
   inherit patches enableMultilib;
 
+  libc_dev = stdenv.gcc.libc_dev;
+
   postPatch =
     if (stdenv.isGNU
         || (libcCross != null                  # e.g., building `gcc.crossDrv'