brltty: build python bindings

pkgs/tools/misc/brltty/default.nix

@@ -1,35 +1,37 @@
-{ stdenv, fetchurl, pkgconfig, alsaSupport, alsaLib ? null, bluez, systemdSupport, systemd ? null }:
+{ stdenv, fetchurl, pkgconfig, python3, alsaSupport, alsaLib ? null, bluez, systemdSupport, systemd ? null }:
 
 assert alsaSupport -> alsaLib != null;
 assert systemdSupport -> systemd != null;
 
 stdenv.mkDerivation rec {
   name = "brltty-5.5";
-  
+
   src = fetchurl {
     url = "http://brltty.com/archive/${name}.tar.gz";
     sha256 = "0slrqanwj9cm7ql0rpb296xq676zrc1sjyr13lh5lygp4b8qfpci";
   };
-  
+
-  nativeBuildInputs = [ pkgconfig ];
+  nativeBuildInputs = [ pkgconfig python3.pkgs.cython ];
   buildInputs = [ bluez ]
     ++ stdenv.lib.optional alsaSupport alsaLib
     ++ stdenv.lib.optional systemdSupport systemd;
-  
+
   meta = {
     description = "Access software for a blind person using a braille display";
     longDescription = ''
       BRLTTY is a background process (daemon) which provides access to the Linux/Unix
       console (when in text mode) for a blind person using a refreshable braille display.
       It drives the braille display, and provides complete screen review functionality.
-      Some speech capability has also been incorporated. 
+      Some speech capability has also been incorporated.
     '';
     homepage = http://www.brltty.com/;
     license = stdenv.lib.licenses.gpl2;
     maintainers = [ stdenv.lib.maintainers.bramd ];
     platforms = stdenv.lib.platforms.all;
   };
-  
+
+  makeFlags = [ "PYTHON_PREFIX=$(out)" ];
+
   preConfigurePhases = [ "preConfigure" ];
 
   preConfigure = ''