Include the libquicktime plugins in the Homebrew build.

On the Mac, we have to ship these along with libquicktime itself, and
define LIBQUICKTIME_PLUGIN_DIR in the environment so that libquicktime
finds them. Otherwise Gem's QT4L plugins won't be of much use.

packages/darwin_app/embed-MacOSX-dependencies.sh

@@ -52,6 +52,8 @@ for pd_darwin in `find $PD_APP_CONTENTS -name '*.pd_darwin'`; do
 done
 
 # check for .so plugins used by libquicktime and others
+rm -rf $PD_APP_PLUGINS/libquicktime
+test -d ${optlocal}/libquicktime/lib/libquicktime && cp -r ${optlocal}/libquicktime/lib/libquicktime $PD_APP_PLUGINS || true
 for so in $PD_APP_PLUGINS/*/*.so; do
 	LIBS=`otool -L $so | sed -n 's|.*'"${optlocal}"'/\(.*\.dylib\).*|\1|p'`
 	if [ "x$LIBS" != "x" ]; then

pd/src/s_main.c

@@ -389,6 +389,17 @@ int sys_main(int argc, char **argv)
 #ifndef MSW
     if (!noprefs)
         sys_rcfile();                           /* parse the startup file */
+#endif
+#ifdef __APPLE__
+    // Initialize libquicktime for Gem, so that it finds its plugins.
+    char *plugins = strdup(argv[0]), *t = strstr(plugins, "/Contents");
+    if (t) {
+      strncpy(t, "/Contents/Plugins/libquicktime", strlen(t));
+      fprintf(stderr, "LIBQUICKTIME_PLUGIN_DIR = %s\n", plugins);
+      // We don't override an existing value here, since the user may have
+      // already set up her own libquicktime plugin collection.
+      setenv("LIBQUICKTIME_PLUGIN_DIR", plugins, 0);
+    }
 #endif
     if (sys_argparse(argc-1, argv+1))           /* parse cmd line */
         return (1);