nixpkgs/pkgs/misc/sane-backends/default.nix

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{ stdenv, fetchurl, hotplugSupport ? true, libusb ? null
, gt68xxFirmware ? null }:
let
firmware = gt68xxFirmware {inherit fetchurl;};
in
assert hotplugSupport -> (stdenv.system == "i686-linux" || stdenv.system == "x86_64-linux");
stdenv.mkDerivation {
name = "sane-backends-1.0.21";
src = fetchurl {
url = ftp://ftp.sane-project.org/pub/sane/sane-backends-1.0.21/sane-backends-1.0.21.tar.gz;
sha256 = "12wl4a86hxwlrx46lm5z6lw4id3j8wi82yv3khxcz5sqjai2ykp4";
};
udevSupport = hotplugSupport;
buildInputs = if libusb != null then [libusb] else [];
postInstall = ''
if test "$udevSupport" = "1"; then
ensureDir $out/etc/udev/rules.d/
./tools/sane-desc -m udev > $out/etc/udev/rules.d/60-libsane.rules || \
cp tools/udev/libsane.rules $out/etc/udev/rules.d/60-libsane.rules
fi
'';
preInstall =
if gt68xxFirmware != null then
"mkdir -p \${out}/share/sane/gt68xx ; ln -s " + firmware.fw +
" \${out}/share/sane/gt68xx/" + firmware.name
else "";
}