sox, ffmpeg_svn expressions added

ghcPkgUtil defines a function to create setup-hook 
- creating a packagedatabase (nix-support/package.conf)
- adding it to GHC_PACKAGE_PATH
see comments for details

svn path=/nixpkgs/trunk/; revision=9500

pkgs/development/libraries/libsamplerate/default.nix

@@ -0,0 +1,35 @@
+args:
+( args.mkDerivationByConfigruation {
+    flagConfig = {
+      mandatory = { buildInputs = ["pkgconfig"];};
+    # are these options of interest? We'll see
+    #--disable-fftw          disable usage of FFTW
+    #--enable-debug          enable debugging
+    #--disable-cpu-clip      disable tricky cpu specific clipper
+
+    }; 
+
+    extraAttrs = co : {
+      name = "libsamplerate-0.1.2";
+
+      src = args.fetchurl {
+        url = http://www.mega-nerd.com/SRC/libsamplerate-0.1.2.tar.gz;
+        sha256 = "1m1iwzpcny42kcqv5as2nyb0ggrb56wzckpximqpp2y74dipdf4q";
+      };
+
+    configurePhase = "
+     export LIBSAMPLERATE_CFLAGS=\"-I \$libsamplerate/include\"
+     export LIBSAMPLERATE_LIBS=\"-L \$libsamplerate/libs\"
+     ./configure --prefix=\$out"+co.configureFlags;
+
+    meta = { 
+      description = "Sample Rate Converter for audio";
+      homepage = http://www.mega-nerd.com/SRC/index.html;
+      # you can choose one of the following licenses: 
+      license = [ "GPL" 
+                  { url=http://www.mega-nerd.com/SRC/libsamplerate-cul.pdf; 
+                    name="libsamplerate Commercial Use License";
+                  } ];
+    };
+  };
+} ) args