diff --git a/pkgs/applications/networking/browsers/chromium/sources.nix b/pkgs/applications/networking/browsers/chromium/sources.nix
index 54d9f44f7fb..780c3b62a30 100644
--- a/pkgs/applications/networking/browsers/chromium/sources.nix
+++ b/pkgs/applications/networking/browsers/chromium/sources.nix
@@ -1,14 +1,14 @@
 # This file is autogenerated from update.sh in the same directory.
 {
   dev = {
-    version = "29.0.1516.3";
-    url = "http://commondatastorage.googleapis.com/chromium-browser-official/chromium-29.0.1516.3.tar.xz";
-    sha256 = "0pdn9c6v0v55d7g4amivxrv132bpj9sfqywk5b8l6kqfjq28mw5k";
+    version = "29.0.1521.3";
+    url = "http://commondatastorage.googleapis.com/chromium-browser-official/chromium-29.0.1521.3.tar.xz";
+    sha256 = "0szc3g24jlhcp8cgijdv0q9rfn3mhp2kjyc85ml4snskkpasfrv3";
   };
   beta = {
-    version = "28.0.1500.36";
-    url = "http://commondatastorage.googleapis.com/chromium-browser-official/chromium-28.0.1500.36.tar.xz";
-    sha256 = "1bz9w46ps8gj056hfwbcj4myyxyr7y759nagz9idraia8116m3pp";
+    version = "28.0.1500.45";
+    url = "http://commondatastorage.googleapis.com/chromium-browser-official/chromium-28.0.1500.45.tar.xz";
+    sha256 = "01sxqv6i7m5h0jsypg801w2ivbrir37wdi4ijd5yvprkyzbd90zi";
   };
   stable = {
     version = "27.0.1453.110";
diff --git a/pkgs/applications/networking/browsers/chromium/update.sh b/pkgs/applications/networking/browsers/chromium/update.sh
index 0c21213a751..0c4881bb396 100755
--- a/pkgs/applications/networking/browsers/chromium/update.sh
+++ b/pkgs/applications/networking/browsers/chromium/update.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 channels_url="http://omahaproxy.appspot.com/all?csv=1";
+history_url="http://omahaproxy.appspot.com/history";
 bucket_url="http://commondatastorage.googleapis.com/chromium-browser-official/";
 output_file="$(cd "$(dirname "$0")" && pwd)/sources.nix";
 
@@ -41,6 +42,17 @@ sha_insert()
     ver_sha_table="$ver_sha_table $version:$sha256";
 }
 
+get_newest_ver()
+{
+    versions="$(for v in $@; do echo "$v"; done)";
+    if oldest="$(echo "$versions" | sort -V 2> /dev/null | tail -n1)";
+    then
+        echo "$oldest";
+    else
+        echo "$versions" | sort -t. -k 1,1n -k 2,2n -k 3,3n -k 4,4n | tail -n1;
+    fi;
+}
+
 if [ -e "$output_file" ];
 then
     get_sha256()
@@ -53,38 +65,55 @@ then
 
         echo -n "Checking if $oldver ($channel) is up to date..." >&2;
 
-        if [ "x$version" != "x$oldver" ];
+        if [ "x$(get_newest_ver "$version" "$oldver")" != "x$oldver" ];
         then
             echo " no, getting sha256 for new version $version:" >&2;
-            sha256="$(nix-prefetch-url "$url")";
+            sha256="$(nix-prefetch-url "$url")" || return 1;
         else
             echo " yes, keeping old sha256." >&2;
-            sha256="$(nix_getattr "$output_file" "$channel.sha256")";
+            sha256="$(nix_getattr "$output_file" "$channel.sha256")" \
+                || return 1;
         fi;
 
         sha_insert "$version" "$sha256";
         echo "$sha256";
+        return 0;
     }
 else
     get_sha256()
     {
-        nix-prefetch-url "$url";
+        nix-prefetch-url "$3";
     }
 fi;
 
+fetch_filtered_history()
+{
+    curl -s "$history_url" | sed -nr 's/^'"linux,$1"',([^,]+).*$/\1/p';
+}
+
+get_prev_sha256()
+{
+    channel="$1";
+    current_version="$2";
+
+    for version in $(fetch_filtered_history "$channel");
+    do
+        [ "x$version" = "x$current_version" ] && continue;
+        url="${bucket_url%/}/chromium-$version.tar.xz";
+        sha256="$(get_sha256 "$channel" "$version" "$url")" || continue;
+        echo "$sha256:$version:$url";
+        return 0;
+    done;
+}
+
 get_channel_exprs()
 {
-    for chline in $(echo "$1" | cut -d, -f-2);
+    for chline in $1;
     do
         channel="${chline%%,*}";
         version="${chline##*,}";
 
-        # XXX: Remove case after version 26 is stable:
-        if [ "${version%%.*}" -ge 26 ]; then
-            url="${bucket_url%/}/chromium-$version.tar.xz";
-        else
-            url="${bucket_url%/}/chromium-$version.tar.bz2";
-        fi;
+        url="${bucket_url%/}/chromium-$version.tar.xz";
 
         echo -n "Checking if sha256 of version $version is cached..." >&2;
         if sha256="$(sha_lookup "$version")";
@@ -93,6 +122,17 @@ get_channel_exprs()
         else
             echo " no." >&2;
             sha256="$(get_sha256 "$channel" "$version" "$url")";
+            if [ $? -ne 0 ];
+            then
+                echo "Whoops, failed to fetch $version, trying previous" \
+                     "versions:" >&2;
+
+                sha_ver_url="$(get_prev_sha256 "$channel" "$version")";
+                sha256="${sha_ver_url%%:*}";
+                ver_url="${sha_ver_url#*:}";
+                version="${ver_url%%:*}";
+                url="${ver_url#*:}";
+            fi;
         fi;
 
         sha_insert "$version" "$sha256";
@@ -108,7 +148,7 @@ get_channel_exprs()
 cd "$(dirname "$0")";
 
 omaha="$(curl -s "$channels_url")";
-versions="$(echo "$omaha" | sed -n -e 's/^linux,\(\([^,]\+,\)\{2\}\).*$/\1/p')";
+versions="$(echo "$omaha" | sed -nr -e 's/^linux,([^,]+,[^,]+).*$/\1/p')";
 channel_exprs="$(get_channel_exprs "$versions")";
 
 cat > "$output_file" <<-EOF
diff --git a/pkgs/development/interpreters/php/5.3.nix b/pkgs/development/interpreters/php/5.3.nix
index 35508230ebd..6a65cce0768 100644
--- a/pkgs/development/interpreters/php/5.3.nix
+++ b/pkgs/development/interpreters/php/5.3.nix
@@ -89,7 +89,12 @@ composableDerivation.composableDerivation {} ( fixed : let inherit (fixed.fixed)
       };
 
       gd = {
-        configureFlags = ["--with-gd=${gd} --with-freetype-dir=${freetype}"];
+        configureFlags = [
+          "--with-gd"
+          "--with-freetype-dir=${freetype}"
+          "--with-png-dir=${libpng}"
+          "--with-jpeg-dir=${libjpeg}"
+        ];
         buildInputs = [gd libpng libjpeg freetype];
       };
 
diff --git a/pkgs/development/interpreters/php/5.4.nix b/pkgs/development/interpreters/php/5.4.nix
index 3c200f9c5c1..35b1f82c246 100644
--- a/pkgs/development/interpreters/php/5.4.nix
+++ b/pkgs/development/interpreters/php/5.4.nix
@@ -90,7 +90,12 @@ composableDerivation.composableDerivation {} ( fixed : let inherit (fixed.fixed)
 
       gd = {
         # FIXME: Our own gd package doesn't work, see https://bugs.php.net/bug.php?id=60108.
-        configureFlags = ["--with-gd --with-freetype-dir=${freetype} --with-png-dir=${libpng}"];
+        configureFlags = [
+          "--with-gd"
+          "--with-freetype-dir=${freetype}"
+          "--with-png-dir=${libpng}"
+          "--with-jpeg-dir=${libjpeg}"
+        ];
         buildInputs = [ libpng libjpeg freetype ];
       };
 
diff --git a/pkgs/development/libraries/javascript/jquery-ui/default.nix b/pkgs/development/libraries/javascript/jquery-ui/default.nix
index e2d48f25bb5..24217657b10 100644
--- a/pkgs/development/libraries/javascript/jquery-ui/default.nix
+++ b/pkgs/development/libraries/javascript/jquery-ui/default.nix
@@ -1,11 +1,11 @@
 { stdenv, fetchurl, unzip }:
 
 stdenv.mkDerivation rec {
-  name = "jquery-ui-1.10.2";
+  name = "jquery-ui-1.10.3";
 
   src = fetchurl {
     url = "http://jqueryui.com/resources/download/${name}.custom.zip";
-    sha256 = "0r1fmqpym7bjqhjay9br4h3izky781bsda7v7552yjwkgiv391hl";
+    sha256 = "1nqh3fmjgy73cbwb5sj775242i6jhz3f5b9fxgrkq00dfvkls779";
   };
 
   buildInputs = [ unzip ];
@@ -17,9 +17,13 @@ stdenv.mkDerivation rec {
 
       # For convenience, provide symlinks "jquery.min.js" etc. (i.e.,
       # without the version number).
-      ln -s $out/js/jquery-ui-*.custom.min.js $out/js/jquery-ui.min.js
-      ln -s $out/js/jquery-1.*.min.js $out/js/jquery.min.js
-      ln -s $out/css/smoothness/jquery-ui-*.custom.css $out/css/smoothness/jquery-ui.css
+      pushd $out/js
+      ln -s jquery-ui-*.custom.js jquery-ui.js
+      ln -s jquery-ui-*.custom.min.js jquery-ui.min.js
+      ln -s jquery-1.*.js jquery.js
+      popd
+      pushd $out/css/smoothness
+      ln -s jquery-ui-*.custom.css jquery-ui.css
     '';
 
   meta = {
diff --git a/pkgs/servers/monitoring/zabbix/2.0.nix b/pkgs/servers/monitoring/zabbix/2.0.nix
index 6b0a22962a3..5131e8a2e42 100644
--- a/pkgs/servers/monitoring/zabbix/2.0.nix
+++ b/pkgs/servers/monitoring/zabbix/2.0.nix
@@ -2,11 +2,11 @@
 
 let
 
-  version = "2.0.4";
+  version = "2.0.6";
 
   src = fetchurl {
     url = "mirror://sourceforge/zabbix/zabbix-${version}.tar.gz";
-    sha256 = "0l8038j6ldsv0ywrs2j69ybjl2zv4qw42791glqvcabjj8x24m3m";
+    sha256 = "1y7dp9rqxkn8ik7bvk2qysz3zp3r07kmax5avlf9jf1x7pkagps6";
   };
 
   preConfigure =
diff --git a/pkgs/tools/package-management/nix/unstable.nix b/pkgs/tools/package-management/nix/unstable.nix
index dfbde642f3f..73bed52654f 100644
--- a/pkgs/tools/package-management/nix/unstable.nix
+++ b/pkgs/tools/package-management/nix/unstable.nix
@@ -5,11 +5,11 @@
 }:
 
 stdenv.mkDerivation rec {
-  name = "nix-1.5.3pre3134_5c06e52";
+  name = "nix-1.5.3pre3141_1b6ee8f";
 
   src = fetchurl {
-    url = "http://hydra.nixos.org/build/5265350/download/5/${name}.tar.xz";
-    sha256 = "82fd6aad66a8646d923a9a65b04879ea5e320391f047549c88ab7d913e5d5903";
+    url = "http://hydra.nixos.org/build/5305802/download/5/${name}.tar.xz";
+    sha256 = "834a0d23456331ac06b6117078f0b9bbeecbc8620d5f844b61455e3daac6ceb0";
   };
 
   nativeBuildInputs = [ perl pkgconfig ];