diff --git a/pkgs/tools/archivers/p7zip/default.nix b/pkgs/tools/archivers/p7zip/default.nix
index c9d97033500..00bc47878f4 100644
--- a/pkgs/tools/archivers/p7zip/default.nix
+++ b/pkgs/tools/archivers/p7zip/default.nix
@@ -1,11 +1,11 @@
 {stdenv, fetchurl}:
 
 stdenv.mkDerivation {
-  name = "p7zip-4.53";
+  name = "p7zip-4.57";
   
   src = fetchurl {
-    url = mirror://sourceforge/p7zip/p7zip_4.53_src_all.tar.bz2;
-    sha256 = "0pbgvpq852qnzq4isgc13p4nnp416xhy5vmn1rcwm8fk43l5rbqd";
+    url = mirror://sourceforge/p7zip/p7zip_4.57_src_all.tar.bz2;
+    sha256 = "0lsvw1bh6dzpxn8kyl7s79w2drpfxaa1c79khqm56gfmdlw27s80";
   };
   
   preConfigure = "
diff --git a/pkgs/tools/compression/lzma/default.nix b/pkgs/tools/compression/lzma/default.nix
index 4ec4dd241e7..67ef9c3add1 100644
--- a/pkgs/tools/compression/lzma/default.nix
+++ b/pkgs/tools/compression/lzma/default.nix
@@ -8,6 +8,9 @@ stdenv.mkDerivation {
     sha256 = "1mqy1biy46gqky6n3gyr2l395hwckh0xyi96waz5p5x8mgp372ch";
   };
 
+  CFLAGS = "-O3";
+  CXXFLAGS = "-O3";
+
   meta = {
     homepage = http://tukaani.org/lzma/;
     description = "The LZMA compression program";