--- a/src/common.h
+++ b/src/common.h
@@ -130,25 +130,25 @@
 } playlist_widgets_t;
 
 /* Globally known widgets */
-transfer_widgets_t transfer_widgets;
-data_widgets_t data_widgets;
-playlist_widgets_t playlist_widgets;
+extern transfer_widgets_t transfer_widgets;
+extern data_widgets_t data_widgets;
+extern playlist_widgets_t playlist_widgets;
 
 /* Global progress bar - not so good but... */
-GtkWidget *progress_bar;
+extern GtkWidget *progress_bar;
 
 /* Global playlist selection for the popup, not good either ... */
-GList *jukebox_playlist;
-GList *selected_target_playlists;
+extern GList *jukebox_playlist;
+extern GList *selected_target_playlists;
 
 /* Global lock variable for the jukebox */
-gboolean volatile jukebox_locked;
+extern gboolean volatile jukebox_locked;
 
 /* Global cancellation variable for jukebox operations */
-gboolean volatile cancel_jukebox_operation;
+extern gboolean volatile cancel_jukebox_operation;
 
 /* Global debug level variable (standard = 7) */
-gint gnomad_debug;
+extern gint gnomad_debug;
 
 /* A proc for hiding dialog windows */
 GCallback dispose_of_dialog_window(GtkButton * button, gpointer data);
--- a/src/gnomad2.c
+++ b/src/gnomad2.c
@@ -34,6 +34,16 @@
 guint uevent_device_hooked = 0;
 #endif
 
+transfer_widgets_t transfer_widgets;
+data_widgets_t data_widgets;
+playlist_widgets_t playlist_widgets;
+GtkWidget *progress_bar;
+GList *jukebox_playlist;
+GList *selected_target_playlists;
+gboolean volatile jukebox_locked;
+gboolean volatile cancel_jukebox_operation;
+gint gnomad_debug;
+
 /* This one should be global really */
 GtkWidget *main_window;