add ekho 5.8.2, a Chinese TTS software

pkgs/applications/audio/ekho/default.nix

@@ -0,0 +1,39 @@
+{ stdenv, fetchurl, pkgconfig
+, libsndfile, pulseaudio
+}:
+
+let
+  version = "5.8.2";
+in stdenv.mkDerivation rec {
+  name = "ekho-${version}";
+
+  meta = with stdenv.lib; {
+    description = "Chinese text-to-speech software";
+    homepage    = "http://www.eguidedog.net/ekho.php";
+    longDescription = ''
+      Ekho (余音) is a free, open source and multilingual text-to-speech (TTS)
+      software. It supports Cantonese (Chinese dialect spoken in Hong Kong and
+      part of Guangdong province), Mandarin (standard Chinese), Zhaoan Hakka
+      (a dialect in Taiwan), Tibetan, Ngangien (an ancient Chinese before
+      Yuan Dynasty) and Korean (in trial).
+    '';
+    license        = licenses.gpl2Plus;
+    platforms      = platforms.linux;
+    hydraPlatforms = [];
+    maintainers    = with maintainers; [ iyzsong ];
+  };
+
+  src = fetchurl {
+    url = "mirror://sourceforge/e-guidedog/Ekho/${version}/${name}.tar.xz";
+    sha256 = "0ym6lpcpsvwvsiwlzkl1509a2hljwcw7synngrmqjq1n49ww00nj";
+  };
+
+  preConfigure = with stdenv.lib; ''
+    NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE ${optionalString stdenv.is64bit "-D_x86_64"}"
+    NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -DEKHO_DATA_PATH=\"$out/share/ekho-data\""
+  '';
+
+  nativeBuildInputs = [ pkgconfig ];
+
+  buildInputs = [ libsndfile pulseaudio ];
+}

pkgs/top-level/all-packages.nix

@@ -7729,6 +7729,8 @@ let
 
   ed = callPackage ../applications/editors/ed { };
 
+  ekho = callPackage ../applications/audio/ekho { };
+
   elinks = callPackage ../applications/networking/browsers/elinks { };
 
   elvis = callPackage ../applications/editors/elvis { };