Patch linuxsampler so that it can load SFZ state when used as an LV2 plugin: http://tracker.ardour.org/view.php?id=4462

pkgs/applications/audio/linuxsampler/default.nix

@@ -11,9 +11,12 @@ stdenv.mkDerivation rec {
     sha256 = "0zsrvs9dwwhjx733m45vfi11yjkqv33z8qxn2i9qriq5zs1f0kd7";
   };
 
-  patchPhase = "sed -e 's/which/type -P/g' -i scripts/generate_parser.sh";
+  patches = ./linuxsampler_lv2_sfz_fix.diff;
 
-  preConfigure = "make -f Makefile.cvs";
+  preConfigure = ''
+    sed -e 's/which/type -P/g' -i scripts/generate_parser.sh
+    make -f Makefile.cvs
+  '';
 
   buildInputs = [ 
    alsaLib asio autoconf automake bison jackaudio libgig libsndfile
@@ -34,7 +37,8 @@ stdenv.mkDerivation rec {
       have questions on the subject, that are not yet covered by the
       FAQ, please contact us.
     ''; 
-    license = licenses.gpl2;
+    license = licenses.proprietary;
     maintainers = [ maintainers.goibhniu ];
+    platforms = platforms.linux;
   };
 }

pkgs/applications/audio/linuxsampler/linuxsampler_lv2_sfz_fix.diff

@@ -0,0 +1,50 @@
+Index: linuxsampler-r2359/src/hostplugins/lv2/PluginLv2.cpp
+===================================================================
+--- linuxsampler-r2359/src/hostplugins/lv2/PluginLv2.cpp	(revision 2359)
++++ linuxsampler-r2359/src/hostplugins/lv2/PluginLv2.cpp	(working copy)
+@@ -18,6 +18,8 @@
+  *   MA  02110-1301  USA                                                   *
+  ***************************************************************************/
+ 
++#define _BSD_SOURCE 1  /* for realpath() */
++
+ #include <algorithm>
+ #include <cassert>
+ #include <cstdio>
+@@ -118,6 +120,23 @@
+         dmsg(2, ("linuxsampler: Deactivate\n"));
+     }
+ 
++    static String RealPath(const String& path)
++    {
++        String out   = path;
++        char*  cpath = NULL;
++#ifdef _WIN32
++        cpath = (char*)malloc(MAX_PATH);
++        GetFullPathName(path.c_str(), MAX_PATH, cpath, NULL);
++#else
++        cpath = realpath(path.c_str(), NULL);
++#endif
++        if (cpath) {
++            out = cpath;
++            free(cpath);
++        }
++        return out;
++    }
++
+     String PluginLv2::PathToState(const String& path) {
+         if (MapPath) {
+             char* cstr = MapPath->abstract_path(MapPath->handle, path.c_str());
+@@ -131,9 +150,10 @@
+     String PluginLv2::PathFromState(const String& path) {
+         if (MapPath) {
+             char* cstr = MapPath->absolute_path(MapPath->handle, path.c_str());
+-            const String abstract_path(cstr);
++            // Resolve symbolic links so SFZ sample paths load correctly
++            const String absolute_path(RealPath(cstr));
+             free(cstr);
+-            return abstract_path;
++            return absolute_path;
+         }
+         return path;
+     }