mixxx: fix build

pkgs/applications/audio/mixxx/default.nix

@@ -13,6 +13,8 @@ stdenv.mkDerivation rec {
     sha256 = "0vb71w1yq0xwwsclrn2jj9bk8w4n14rfv5c0aw46c11mp8xz7f71";
   };
 
+  patches = [ ./sqlite.patch ]; # from: https://bugs.gentoo.org/show_bug.cgi?id=622776
+
   buildInputs = [
     chromaprint fftw flac libid3tag libmad libopus libshout libsndfile
     libusb1 libvorbis pkgconfig portaudio portmidi protobuf qt4

pkgs/applications/audio/mixxx/sqlite.patch

@@ -0,0 +1,13 @@
+diff -urN old/src/library/trackcollection.h mixxx-2.0.0/src/library/trackcollection.h
+--- old/src/library/trackcollection.h	2017-07-30 00:04:48.511029517 -0400
++++ mixxx-2.0.0/src/library/trackcollection.h	2017-07-30 00:05:03.378699826 -0400
+@@ -34,8 +34,7 @@
+ #include "library/dao/libraryhashdao.h"
+
+ #ifdef __SQLITE3__
+-typedef struct sqlite3_context sqlite3_context;
+-typedef struct Mem sqlite3_value;
++#include <sqlite3.h>
+ #endif
+
+ class TrackInfoObject;