diff --git a/pkgs/applications/networking/browsers/mozilla-plugins/mplayerplug-in/builder.sh b/pkgs/applications/networking/browsers/mozilla-plugins/mplayerplug-in/builder.sh
deleted file mode 100644
index 62b4b5a2f88..00000000000
--- a/pkgs/applications/networking/browsers/mozilla-plugins/mplayerplug-in/builder.sh
+++ /dev/null
@@ -1,21 +0,0 @@
-source $stdenv/setup
-
-# The Firefox pkgconfig files are buggy; they are called firefox-*.pc,
-# but they refer to mozilla-*.pc.  Also, mplayerplug-in requires
-# mozilla-*.pc.
-mkdir pkgconfig
-for i in $firefox/lib/pkgconfig/*.pc; do
-    ln -s $i pkgconfig/$(echo $(basename $i) | sed s/firefox/mozilla/)
-done
-PKG_CONFIG_PATH=$NIX_BUILD_TOP/pkgconfig:$PKG_CONFIG_PATH
-
-firefoxIncl=$(echo $firefox/include/firefox-*)
-export NIX_CFLAGS_COMPILE="-I$firefoxIncl $NIX_CFLAGS_COMPILE"
-
-installPhase() {
-    ensureDir $out/lib/mozilla/plugins
-    cp -p mplayerplug-in*.so mplayerplug-in*.xpt $out/lib/mozilla/plugins
-}
-
-genericBuild
-
diff --git a/pkgs/applications/networking/browsers/mozilla-plugins/mplayerplug-in/default.nix b/pkgs/applications/networking/browsers/mozilla-plugins/mplayerplug-in/default.nix
index 8cf23085d51..f9acabc0c22 100644
--- a/pkgs/applications/networking/browsers/mozilla-plugins/mplayerplug-in/default.nix
+++ b/pkgs/applications/networking/browsers/mozilla-plugins/mplayerplug-in/default.nix
@@ -1,14 +1,8 @@
 {stdenv, fetchurl, pkgconfig, firefox, libXpm, gettext}:
 
-# Note: we shouldn't be dependent on Firefox.  The only thing we need
-# are the include files so that we can access the plugin API (I
-# think).
-
 stdenv.mkDerivation rec {
   name = "mplayerplug-in-3.55";
 
-  builder = ./builder.sh;
-  
   src = fetchurl {
     url = "mirror://sourceforge/mplayerplug-in/${name}.tar.gz";
     sha256 = "0zkvqrzibrbljiccvz3rhbmgifxadlrfjylqpz48jnjx9kggynms";
@@ -16,7 +10,10 @@ stdenv.mkDerivation rec {
 
   buildInputs = [pkgconfig firefox (firefox.gtk) libXpm gettext];
   
-  inherit firefox;
+  installPhase = ''
+    ensureDir $out/lib/mozilla/plugins
+    cp -p mplayerplug-in*.so mplayerplug-in*.xpt $out/lib/mozilla/plugins
+  '';
 
   passthru = {
     mozillaPlugin = "/lib/mozilla/plugins";