--- a/src/common.h
+++ b/src/common.h
@@ -129,8 +129,8 @@
 extern int      ReadRecSrc(void);
 extern int      WriteRecSrc(void);
 int             ReadWriteMixer(int device, char *rw, int *left, int *right, char *rp);
-int             ourlevel[SOUND_MIXER_NRDEVICES];
-int             our_recplay[SOUND_MIXER_NRDEVICES];	/* Store record/play settings for updates. */
+extern int             ourlevel[SOUND_MIXER_NRDEVICES];
+extern int             our_recplay[SOUND_MIXER_NRDEVICES];	/* Store record/play settings for updates. */
 int             LoadSettings(void);
 int             SaveSettings(void);
 int             dummy_ioctl(int fd, unsigned long req, int *arg);
--- a/src/curses.c
+++ b/src/curses.c
@@ -27,8 +27,9 @@
 #include "mouse.h"
 
 unsigned char  *key_keys, *key_load, *key_mute, *key_only, *key_quit, *key_save, *key_undo, *lang;
-int             current_dev, level_increment, balance_increment, menu_width, level_width, label_width, balance_width, levelbalmode, cols_saved, lines_saved;
+int             level_increment, balance_increment, menu_width, level_width, label_width, balance_width, levelbalmode, cols_saved, lines_saved;
 int             in_keysbox = FALSE;
+int             (*Wgetch) (WINDOW * win);
 static int	cursor_x, cursor_y;	/* keep track of cursor position */
 
 void            InitScreenCurses(void)
--- a/src/curses.h
+++ b/src/curses.h
@@ -88,8 +88,8 @@
 };
 #define ARROW_WIDTH 1		/* width of selection arrow */
 #define R_P_WIDTH 1		/* width of record/play indicator */
-int             level_increment, balance_increment, menu_width, level_width, label_width, balance_width, levelbalmode;
-int             (*Wgetch) (WINDOW * win);
+extern int             level_increment, balance_increment, menu_width, level_width, label_width, balance_width, levelbalmode;
+extern int             (*Wgetch) (WINDOW * win);
 #define Getch() (*Wgetch)(stdscr)
 void            WakeUpCurses(void);
 void            InitScreenCurses(void);
--- a/src/gtk.c
+++ b/src/gtk.c
@@ -45,6 +45,24 @@
 #include "interactive.h"
 #include <signal.h>		/* SIGALRM */
 
+GdkBitmap      *rmask;
+GdkBitmap      *pmask;
+GtkWidget      *pixmapwid[SOUND_MIXER_NRDEVICES];
+GdkPixmap      *record_pixmap;
+GdkPixmap      *play_pixmap;
+GtkAdjustment  *adjustment[SOUND_MIXER_NRDEVICES];
+GtkAdjustment  *balance[SOUND_MIXER_NRDEVICES];
+GtkWidget      *baltracks[SOUND_MIXER_NRDEVICES];
+GtkWidget      *channellabel[SOUND_MIXER_NRDEVICES];
+GtkToggleButton *rpbuttons[SOUND_MIXER_NRDEVICES];
+GtkWidget      *levels[SOUND_MIXER_NRDEVICES];
+GtkWidget      *maintable;
+gint            balcallback[SOUND_MIXER_NRDEVICES];
+gint            lvlcallback[SOUND_MIXER_NRDEVICES];
+gint            rpcallback[SOUND_MIXER_NRDEVICES];
+gboolean        menuvisible, balancevisible, recplayvisible, valuesvisible, visible[SOUND_MIXER_NRDEVICES];
+GtkWidget      *labelrec, *labelzero, *labelcent, *labelleft, *labelright, *labelbalance;
+
 void            SaveSettingsGTK(void)
 {
 	(void) SaveSettings();
--- a/src/gtk.h
+++ b/src/gtk.h
@@ -7,23 +7,23 @@
 #include <sys/mman.h>
 #include <gtk/gtk.h>
 
-GdkBitmap      *rmask;
-GdkBitmap      *pmask;
-GtkWidget      *pixmapwid[SOUND_MIXER_NRDEVICES];
-GdkPixmap      *record_pixmap;
-GdkPixmap      *play_pixmap;
-GtkAdjustment  *adjustment[SOUND_MIXER_NRDEVICES];
-GtkAdjustment  *balance[SOUND_MIXER_NRDEVICES];
-GtkWidget      *baltracks[SOUND_MIXER_NRDEVICES];
-GtkWidget      *channellabel[SOUND_MIXER_NRDEVICES];
-GtkToggleButton *rpbuttons[SOUND_MIXER_NRDEVICES];
-GtkWidget      *levels[SOUND_MIXER_NRDEVICES];
-GtkWidget      *maintable;
-gint            balcallback[SOUND_MIXER_NRDEVICES];
-gint            lvlcallback[SOUND_MIXER_NRDEVICES];
-gint            rpcallback[SOUND_MIXER_NRDEVICES];
-gboolean        menuvisible, balancevisible, recplayvisible, valuesvisible, visible[SOUND_MIXER_NRDEVICES];
-GtkWidget      *labelrec, *labelzero, *labelcent, *labelleft, *labelright, *labelbalance;
+extern GdkBitmap      *rmask;
+extern GdkBitmap      *pmask;
+extern GtkWidget      *pixmapwid[SOUND_MIXER_NRDEVICES];
+extern GdkPixmap      *record_pixmap;
+extern GdkPixmap      *play_pixmap;
+extern GtkAdjustment  *adjustment[SOUND_MIXER_NRDEVICES];
+extern GtkAdjustment  *balance[SOUND_MIXER_NRDEVICES];
+extern GtkWidget      *baltracks[SOUND_MIXER_NRDEVICES];
+extern GtkWidget      *channellabel[SOUND_MIXER_NRDEVICES];
+extern GtkToggleButton *rpbuttons[SOUND_MIXER_NRDEVICES];
+extern GtkWidget      *levels[SOUND_MIXER_NRDEVICES];
+extern GtkWidget      *maintable;
+extern gint            balcallback[SOUND_MIXER_NRDEVICES];
+extern gint            lvlcallback[SOUND_MIXER_NRDEVICES];
+extern gint            rpcallback[SOUND_MIXER_NRDEVICES];
+extern gboolean        menuvisible, balancevisible, recplayvisible, valuesvisible, visible[SOUND_MIXER_NRDEVICES];
+extern GtkWidget      *labelrec, *labelzero, *labelcent, *labelleft, *labelright, *labelbalance;
 void            WakeUpGTK(void);
 void            HideShowBalancesGTK(void);
 void            HideShowNumbersGTK(void);
--- a/src/interactive.c
+++ b/src/interactive.c
@@ -28,6 +28,9 @@
 #include "gtk.h"
 #endif				/* HAVE_GTK */
 
+int ourlevel[SOUND_MIXER_NRDEVICES];
+int our_recplay[SOUND_MIXER_NRDEVICES];
+
 void            AumixSignalHandler(int signal_number)
 {
 /* Handle SIGALRM. */
--- a/src/interactive.h
+++ b/src/interactive.h
@@ -7,7 +7,7 @@
 #define MUTE_ONLY 2
 #define        REFRESH_PERIOD 1	/* number of seconds between updates */
 
-unsigned char  *key_keys, *key_load, *key_mute, *key_only, *key_quit, *key_save, *key_undo;
+extern unsigned char  *key_keys, *key_load, *key_mute, *key_only, *key_quit, *key_save, *key_undo;
 void            AumixSignalHandler(int signal_number);
 void            InitScreen(void);
 void            KeysBox(void);