diff --git a/pkgs/applications/misc/audio/sox/default.nix b/pkgs/applications/misc/audio/sox/default.nix
index 91bd5be07880..c0cf9d91b730 100644
--- a/pkgs/applications/misc/audio/sox/default.nix
+++ b/pkgs/applications/misc/audio/sox/default.nix
@@ -1,5 +1,5 @@
 args:
-( args.mkDerivationByConfigruation {
+( args.mkDerivationByConfiguration {
     flagConfig = {
     mandatory = { implies = [ "no_oss" "no_sun_audio" ]; };
     # are these options of interest? We'll see
diff --git a/pkgs/build-support/fetchsvn/builder.sh b/pkgs/build-support/fetchsvn/builder.sh
index d06efa88e291..b53ce95579ab 100644
--- a/pkgs/build-support/fetchsvn/builder.sh
+++ b/pkgs/build-support/fetchsvn/builder.sh
@@ -12,7 +12,7 @@ fi
 # hash of the output matters.
 echo 'p' | svn export -r "$rev" "$url" $out
 
-actual=$(nix-hash $out)
+actual=$(nix-hash $out --type "$outputHashAlgo")
 if test "$actual" != "$outputHash"; then
     echo "hash is $actual, expected $outputHash" >&2
     exit 1
diff --git a/pkgs/build-support/fetchsvn/default.nix b/pkgs/build-support/fetchsvn/default.nix
index ff842b0ee243..ce6a1e61d9cf 100644
--- a/pkgs/build-support/fetchsvn/default.nix
+++ b/pkgs/build-support/fetchsvn/default.nix
@@ -1,4 +1,5 @@
-{stdenv, subversion, nix, sshSupport ? false, openssh ? null}: {url, rev ? "HEAD", md5}:
+{stdenv, subversion, nix, sshSupport ? false, openssh ? null}: 
+{url, rev ? "HEAD", md5 ? "", sha256 ? ""}:
 
 stdenv.mkDerivation {
   name = "svn-export";
@@ -6,11 +7,11 @@ stdenv.mkDerivation {
   buildInputs = [subversion nix];
 
   # Nix <= 0.7 compatibility.
-  id = md5;
+  /*id = if sha256 == "" then md5 else sha256;*/
 
-  outputHashAlgo = "md5";
+  outputHashAlgo = if sha256=="" then "md5" else "sha256";
   outputHashMode = "recursive";
-  outputHash = md5;
+  outputHash = if sha256 =="" then md5 else sha256;
   
   inherit url rev sshSupport openssh;
 }
diff --git a/pkgs/development/libraries/ffmpeg_svn_snapshot/default.nix b/pkgs/development/libraries/ffmpeg_svn_snapshot/default.nix
index 3719f1301a3f..f3611afb0b63 100644
--- a/pkgs/development/libraries/ffmpeg_svn_snapshot/default.nix
+++ b/pkgs/development/libraries/ffmpeg_svn_snapshot/default.nix
@@ -1,11 +1,16 @@
-{stdenv, fetchurl}:
+{stdenv, fetchsvn}:
 
 stdenv.mkDerivation {
-  name = "ffmpeg-svn";
-  src = fetchurl {
+  name = "ffmpeg-svn-2007-12-04";
+  src = fetchsvn {
+    url = svn://svn.mplayerhq.hu/ffmpeg/trunk ;
+    rev = "11164";
+    sha256 = "95658455e466aeab5a302ddd6e7b2f79f620d4495012add46028a548e6c364b2";
+  };
+  /*fetchurl {
     url = http://ffmpeg.mplayerhq.hu/ffmpeg-export-snapshot.tar.bz2;
     sha256 = "040a35f0c004323af14329c09ad3cff8d040e2cf9797d97cde3d9d83d02b4d87";
-  };
+  };*/
   # !!! Hm, what are the legal consequences of --enable-gpl?
   configureFlags = "--enable-shared --enable-pp --enable-gpl --disable-ffserver --disable-ffplay";
 }
diff --git a/pkgs/development/libraries/libsamplerate/default.nix b/pkgs/development/libraries/libsamplerate/default.nix
index 895772d7fc0c..2ea959528a87 100644
--- a/pkgs/development/libraries/libsamplerate/default.nix
+++ b/pkgs/development/libraries/libsamplerate/default.nix
@@ -1,5 +1,5 @@
 args:
-( args.mkDerivationByConfigruation {
+( args.mkDerivationByConfiguration {
     flagConfig = {
       mandatory = { buildInputs = ["pkgconfig"];};
     # are these options of interest? We'll see
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 3023dbd5c2ed..d02a94bfdcc0 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -204,7 +204,7 @@ rec {
     args: with args.lib; with args;
     if ( builtins.isAttrs extraAttrs ) then builtins.throw "the argument extraAttrs needs to be a function beeing passed co, but attribute set passed "
     else
-    let co = chooseOptionsByFlags { inherit args flagConfig optionals defaults collectExtraPhaseActions; }; in
+    let co = lib_unstable.chooseOptionsByFlags { inherit args flagConfig optionals defaults collectExtraPhaseActions; }; in
       args.stdenv.mkDerivation ( 
       {
         inherit (co) configureFlags buildInputs /*flags*/;
@@ -674,6 +674,14 @@ rec {
     zlibSupport = !stdenv ? isDietLibC;
   };
 
+  /*relfsFun = lib.sumArgs (selectVersion ../tools/misc/relfs) {
+    inherit fetchcvs stdenv ocaml postgresql fuse builderDefs;
+  };
+
+  relfs = relfsFun {
+    version = "cvs.2007.12.01";
+  } null;*/
+
   replace = import ../tools/text/replace {
     inherit fetchurl stdenv;
   };
@@ -1740,7 +1748,7 @@ rec {
   };
 
   ffmpeg_svn = import ../development/libraries/ffmpeg_svn_snapshot {
-    inherit fetchurl stdenv;
+    inherit fetchsvn stdenv;
   };
 
   fftw = import ../development/libraries/fftw {
@@ -2052,9 +2060,9 @@ rec {
   };
 
   # commented out because it's using the new configuration style proposal which is unstable
-  #libsamplerate = (import ../development/libraries/libsamplerate) {
-  #  inherit fetchurl stdenv mkDerivationByConfigruation pkgconfig lib;
-  #};
+  libsamplerate = if builtins ? listToAttrs then (import ../development/libraries/libsamplerate) {
+    inherit fetchurl stdenv mkDerivationByConfiguration pkgconfig lib;
+  } else null;
 
   libgsf = import ../development/libraries/libgsf {
     inherit fetchurl stdenv perl perlXMLParser pkgconfig libxml2 gettext bzip2
@@ -4260,9 +4268,9 @@ rec {
   } null;
 
   # commented out because it's using the new configuration style proposal which is unstable
-  /*
-  sox = import ../applications/misc/audio/sox {
-    inherit fetchurl stdenv lib mkDerivationByConfigruation;
+  
+  sox = if builtins ? listToAttrs then  import ../applications/misc/audio/sox {
+    inherit fetchurl stdenv lib mkDerivationByConfiguration;
     # optional features 
     inherit alsaLib; # libao
     inherit libsndfile libogg flac libmad lame libsamplerate;
@@ -4271,8 +4279,8 @@ rec {
      # /tmp/nix-7957-1/sox-14.0.0/src/ffmpeg.c:130: undefined reference to `avcodec_decode_audio2
      # That's why I'v added ffmpeg_svn
     ffmpeg = ffmpeg_svn;
-  };
-  */
+  } else null;
+  
 
   spoofax = import ../applications/editors/eclipse/plugins/spoofax {
     inherit fetchurl stdenv;
diff --git a/pkgs/top-level/builder-defs.nix b/pkgs/top-level/builder-defs.nix
index 94f83b9c06fd..4e6a84a25ebf 100644
--- a/pkgs/top-level/builder-defs.nix
+++ b/pkgs/top-level/builder-defs.nix
@@ -12,6 +12,7 @@ args: with args; with stringsWithDeps; with lib;
 		else if (hasSuffixHack ".tar.gz" s) || (hasSuffixHack ".tgz" s) then "tgz" 
 		else if (hasSuffixHack ".tar.bz2" s) || (hasSuffixHack ".tbz2" s) then "tbz2"
 		else if (hasSuffixHack ".zip" s) || (hasSuffixHack ".ZIP" s) then "zip"
+		else if (hasSuffixHack "-cvs-export" s) then "cvs-dir"
 		else (abort "unknown archive type : ${s}"));
 
 	defAddToSearchPath = FullDepEntry ("
@@ -175,6 +176,9 @@ args: with args; with stringsWithDeps; with lib;
 		unzip '${s}'
 		cd \"$( unzip -lqq '${s}' | tail -1 | 
 			sed -e 's@^\\(\\s\\+[-0-9:]\\+\\)\\{3,3\\}\\s\\+\\([^/]\\+\\)/.*@\\2@' )\"
+	" else if (archiveType s) == "cvs-dir" then "
+		cp -r '${s}' .
+		cd \$(basename ${s})
 	" else (abort "unknown archive type : ${s}"))+
 		(if args ? goSrcDir then args.goSrcDir else "")
 	) [minInit];