diff -Naur a/src/interface.c b/src/interface.c
--- a/src/interface.c	2016-02-21 01:06:17.000000000 +0100
+++ b/src/interface.c	2016-09-13 19:37:28.038350050 +0200
@@ -26,6 +26,18 @@
 #include <glib/gi18n.h>
 #include "interface.h"
 
+GtkTreeStore *list_store;
+GtkTreeSelection *selection;
+GtkWidget *treeview;
+GtkWidget *mainmenu;
+GtkWidget *taskpopup;
+GtkWidget *cpu_usage_progress_bar;
+GtkWidget *mem_usage_progress_bar;
+GtkWidget *cpu_usage_progress_bar_box;
+GtkWidget *mem_usage_progress_bar_box;
+
+GtkTreeViewColumn *column;
+
 #define GLADE_HOOKUP_OBJECT(component,widget,name) \
   g_object_set_data_full (G_OBJECT (component), name, \
     gtk_widget_ref (widget), (GDestroyNotify) gtk_widget_unref)
diff -Naur a/src/interface.h b/src/interface.h
--- a/src/interface.h	2014-09-16 14:27:52.000000000 +0200
+++ b/src/interface.h	2016-09-13 19:32:22.816372893 +0200
@@ -38,16 +38,15 @@
 #include "callbacks.h"
 #include "types.h"
 
-GtkTreeStore *list_store;
-GtkTreeSelection *selection;
-GtkWidget *treeview;
-GtkWidget *mainmenu;
-GtkWidget *taskpopup;
-GtkWidget *priopopup;
-GtkWidget *cpu_usage_progress_bar;
-GtkWidget *mem_usage_progress_bar;
-GtkWidget *cpu_usage_progress_bar_box;
-GtkWidget *mem_usage_progress_bar_box;
+extern GtkTreeStore *list_store;
+extern GtkTreeSelection *selection;
+extern GtkWidget *treeview;
+extern GtkWidget *mainmenu;
+extern GtkWidget *taskpopup;
+extern GtkWidget *cpu_usage_progress_bar;
+extern GtkWidget *mem_usage_progress_bar;
+extern GtkWidget *cpu_usage_progress_bar_box;
+extern GtkWidget *mem_usage_progress_bar_box;
 
 enum {
     COLUMN_NAME = 0,
@@ -61,7 +60,7 @@
     COLUMN_PPID
 };
 
-GtkTreeViewColumn *column;
+extern GtkTreeViewColumn *column;
 
 void change_list_store_view(void);
 void create_list_store(void);
diff -Naur a/src/types.h b/src/types.h
--- a/src/types.h	2014-09-16 14:27:52.000000000 +0200
+++ b/src/types.h	2016-09-13 19:25:51.014402217 +0200
@@ -77,9 +77,6 @@
 extern gint win_width;
 extern gint win_height;
 
-const gchar *custom_signal_0;
-const gchar *custom_signal_1;
-
 extern int page_size;
 
 #endif