diff --git a/pkgs/applications/video/gnash/builder.sh b/pkgs/applications/video/gnash/builder.sh
index b24a2cb58409..519007fa55ec 100644
--- a/pkgs/applications/video/gnash/builder.sh
+++ b/pkgs/applications/video/gnash/builder.sh
@@ -1,5 +1,5 @@
 source "$stdenv/setup" || exit 1
 
-configureFlags="--with-sdl-mixer-incl=$SDL_mixer/include/SDL --with-sdl-incl=$SDL/include/SDL --with-plugindir=$out/plugins --enable-gui=gtk"
+configureFlags="--with-sdl-mixer-incl=$SDL_mixer/include/SDL --with-sdl-incl=$SDL/include/SDL --with-npapi-plugindir=$out/plugins --enable-gui=gtk"
 
 genericBuild
diff --git a/pkgs/applications/video/gnash/default.nix b/pkgs/applications/video/gnash/default.nix
index 4ca28fb164d6..d83353af4775 100644
--- a/pkgs/applications/video/gnash/default.nix
+++ b/pkgs/applications/video/gnash/default.nix
@@ -8,12 +8,13 @@
 stdenv.mkDerivation rec {
   name = "gnash-0.8.2";
 
-  builder = ./builder.sh;
   src = fetchurl {
     url = "mirror://gnu/gnash/0.8.2/${name}.tar.bz2";
     sha256 = "1akbs0wkgiawrjwwgp5w0cqn0qn3fcnfv40scjlrvdqrcqgfg0ac";
   };
 
+  builder = ./builder.sh;
+
   patchPhase = ''
     # Add all libs to `macros/libslist', a list of library search paths.
     for lib in ${lib.concatStringsSep " "
@@ -30,6 +31,9 @@ stdenv.mkDerivation rec {
 		 dbus curl pkgconfig glib gtk];
   inherit SDL_mixer SDL;
 
+  preInstall = ''ensureDir $out/plugins'';
+  postInstall = ''make install-plugins'';
+
   meta = {
     homepage = http://www.gnu.org/software/gnash/;
     description = ''Gnash is the GNU Flash movie player.'';