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diff --git a/machines/profpatsch/tmp/sane/backends/generic.nix b/machines/profpatsch/tmp/sane/backends/generic.nix
new file mode 100644
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+++ b/machines/profpatsch/tmp/sane/backends/generic.nix
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+{ stdenv, fetchurl
+, avahi, libjpeg, libusb1, libv4l, net_snmp
+, gettext, pkgconfig
+
+# List of { src name backend } attibute sets - see installFirmware below:
+, extraFirmware ? []
+
+# For backwards compatibility with older setups; use extraFirmware instead:
+, gt68xxFirmware ? null, snapscanFirmware ? null
+
+# Passed from versioned package (e.g. default.nix, git.nix):
+, version, src, ...
+}:
+
+stdenv.mkDerivation {
+  inherit src version;
+
+  name = "sane-backends-${version}";
+
+  outputs = [ "out" "doc" "man" ];
+
+  configureFlags = []
+    ++ stdenv.lib.optional (avahi != null) "--enable-avahi"
+    ++ stdenv.lib.optional (libusb1 != null) "--enable-libusb_1_0"
+    ;
+
+  buildInputs = [ avahi libusb1 libv4l net_snmp ];
+  nativeBuildInputs = [ gettext pkgconfig ];
+
+  postInstall = let
+
+    compatFirmware = extraFirmware
+      ++ stdenv.lib.optional (gt68xxFirmware != null) {
+        src = gt68xxFirmware.fw;
+        inherit (gt68xxFirmware) name;
+        backend = "gt68xx";
+      }
+      ++ stdenv.lib.optional (snapscanFirmware != null) {
+        src = snapscanFirmware;
+        name = "your-firmwarefile.bin";
+        backend = "snapscan";
+      };
+
+    installFirmware = f: ''
+      mkdir -p $out/share/sane/${f.backend}
+      ln -sv ${f.src} $out/share/sane/${f.backend}/${f.name}
+    '';
+
+  in ''
+    mkdir -p $out/etc/udev/rules.d/
+    ./tools/sane-desc -m udev > $out/etc/udev/rules.d/49-libsane.rules || \
+    cp tools/udev/libsane.rules $out/etc/udev/rules.d/49-libsane.rules
+    # the created 49-libsane references /bin/sh
+    substituteInPlace $out/etc/udev/rules.d/49-libsane.rules \
+      --replace "RUN+=\"/bin/sh" "RUN+=\"${stdenv.shell}"
+
+    substituteInPlace $out/lib/libsane.la \
+      --replace "-ljpeg" "-L${libjpeg}/lib -ljpeg"
+  '' + stdenv.lib.concatStrings (builtins.map installFirmware compatFirmware);
+
+  meta = with stdenv.lib; {
+    description = "SANE (Scanner Access Now Easy) backends";
+    longDescription = ''
+      Collection of open-source SANE backends (device drivers).
+      SANE is a universal scanner interface providing standardized access to
+      any raster image scanner hardware: flatbed scanners, hand-held scanners,
+      video- and still-cameras, frame-grabbers, etc. For a list of supported
+      scanners, see http://www.sane-project.org/sane-backends.html.
+    '';
+    homepage = "http://www.sane-project.org/";
+    license = licenses.gpl2Plus;
+
+    maintainers = with maintainers; [ nckx simons ];
+    platforms = platforms.linux;
+  };
+}