diff --git a/pkgs/development/tools/misc/patchelf/default.nix b/pkgs/development/tools/misc/patchelf/default.nix
index 5aa81e46bed1..7154166c2516 100644
--- a/pkgs/development/tools/misc/patchelf/default.nix
+++ b/pkgs/development/tools/misc/patchelf/default.nix
@@ -1,11 +1,11 @@
 { stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
-  name = "patchelf-0.8";
+  name = "patchelf-0.9";
 
   src = fetchurl {
     url = "http://nixos.org/releases/patchelf/${name}/${name}.tar.bz2";
-    sha256 = "c99f84d124347340c36707089ec8f70530abd56e7827c54d506eb4cc097a17e7";
+    sha256 = "a0f65c1ba148890e9f2f7823f4bedf7ecad5417772f64f994004f59a39014f83";
   };
 
   setupHook = [ ./setup-hook.sh ];
diff --git a/pkgs/tools/graphics/netpbm/default.nix b/pkgs/tools/graphics/netpbm/default.nix
index e69a73ff321e..3b9f4e64d07d 100644
--- a/pkgs/tools/graphics/netpbm/default.nix
+++ b/pkgs/tools/graphics/netpbm/default.nix
@@ -38,7 +38,7 @@ stdenv.mkDerivation rec {
     touch lib/standardppmdfont.c
   '';
 
-  enableParallelBuilding = true;
+  enableParallelBuilding = false;
 
   installPhase = ''
     make package pkgdir=$out