Fix compilation errors when compiling without spotify

src/engines/gstenginepipeline.cpp

@@ -18,14 +18,18 @@
 #include <limits>
 
 #include "bufferconsumer.h"
+#include "config.h"
 #include "gstelementdeleter.h"
 #include "gstengine.h"
 #include "gstenginepipeline.h"
 #include "core/logging.h"
 #include "core/utilities.h"
 #include "internet/internetmodel.h"
-#include "internet/spotifyserver.h"
-#include "internet/spotifyservice.h"
+
+#ifdef HAVE_SPOTIFY
+#  include "internet/spotifyserver.h"
+#  include "internet/spotifyservice.h"
+#endif
 
 #include <QtConcurrentRun>
 
@@ -128,6 +132,7 @@ bool GstEnginePipeline::ReplaceDecodeBin(const QUrl& url) {
   GstElement* new_bin = NULL;
 
   if (url.scheme() == "spotify") {
+    #ifdef HAVE_SPOTIFY
       new_bin = gst_bin_new("spotify_bin");
 
       // Create elements
@@ -151,6 +156,10 @@ bool GstEnginePipeline::ReplaceDecodeBin(const QUrl& url) {
 
       // Tell spotify to start sending data to us.
       InternetModel::Service<SpotifyService>()->server()->StartPlaybackLater(url.toString(), port);
+    #else // HAVE_SPOTIFY
+      qLog(Error) << "Tried to play a spotify:// url, but spotify support is not compiled in";
+      return false;
+    #endif
   } else {
     new_bin = engine_->CreateElement("uridecodebin");
     g_object_set(G_OBJECT(new_bin), "uri", url.toEncoded().constData(), NULL);