diff -Naur wmclockmon-0.8.1.orig/src/main.c wmclockmon-0.8.1/src/main.c
--- wmclockmon-0.8.1.orig/src/main.c	2005-06-15 16:04:57.000000000 +0200
+++ wmclockmon-0.8.1/src/main.c	2020-02-24 22:27:45.957224984 +0100
@@ -221,6 +221,7 @@
 static char*     label             = NULL;
 
 
+
 /* prototypes */
 static void rotate_style();
 static Bool stringdiff(const char *s1, const char *s2);
diff -Naur wmclockmon-0.8.1.orig/wmclockmon-cal/main.c wmclockmon-0.8.1/wmclockmon-cal/main.c
--- wmclockmon-0.8.1.orig/wmclockmon-cal/main.c	2005-06-15 15:55:27.000000000 +0200
+++ wmclockmon-0.8.1/wmclockmon-cal/main.c	2020-02-24 22:35:38.832391977 +0100
@@ -15,6 +15,22 @@
 #include "mainwindow.h"
 #include "main.h"
 
+GtkWidget *application;
+GtkWidget *alarmlist;
+GtkWidget *wid_backlight;
+GtkWidget *wid_blink;
+GtkWidget *wid_styledir;
+GtkWidget *wid_stylename;
+GtkWidget *wid_color;
+GtkWidget *wid_command;
+GtkWidget *wid_msgcmd;
+GtkWidget *wid_h12;
+GtkWidget *wid_itm;
+GtkWidget *wid_locale;
+
+int selected_row;
+
+struct tm *timeinfos;
 
 void Usage () {
     printf("Usage: "PACKAGE"-cal [-h] [-v]\n"
diff -Naur wmclockmon-0.8.1.orig/wmclockmon-cal/main.h wmclockmon-0.8.1/wmclockmon-cal/main.h
--- wmclockmon-0.8.1.orig/wmclockmon-cal/main.h	2005-06-15 15:55:27.000000000 +0200
+++ wmclockmon-0.8.1/wmclockmon-cal/main.h	2020-02-24 22:35:32.799388390 +0100
@@ -9,7 +9,7 @@
 #include <sys/time.h>
 
 
-struct tm *timeinfos;
+extern struct tm *timeinfos;
 
 void quit_app();
 
diff -Naur wmclockmon-0.8.1.orig/wmclockmon-cal/mainwindow.h wmclockmon-0.8.1/wmclockmon-cal/mainwindow.h
--- wmclockmon-0.8.1.orig/wmclockmon-cal/mainwindow.h	2005-06-15 15:55:27.000000000 +0200
+++ wmclockmon-0.8.1/wmclockmon-cal/mainwindow.h	2020-02-24 22:34:22.609356664 +0100
@@ -7,20 +7,20 @@
 
 #include <gtk/gtk.h>
 
-GtkWidget *application;
-GtkWidget *alarmlist;
-GtkWidget *wid_backlight;
-GtkWidget *wid_blink;
-GtkWidget *wid_styledir;
-GtkWidget *wid_stylename;
-GtkWidget *wid_color;
-GtkWidget *wid_command;
-GtkWidget *wid_msgcmd;
-GtkWidget *wid_h12;
-GtkWidget *wid_itm;
-GtkWidget *wid_locale;
+extern GtkWidget *application;
+extern GtkWidget *alarmlist;
+extern GtkWidget *wid_backlight;
+extern GtkWidget *wid_blink;
+extern GtkWidget *wid_styledir;
+extern GtkWidget *wid_stylename;
+extern GtkWidget *wid_color;
+extern GtkWidget *wid_command;
+extern GtkWidget *wid_msgcmd;
+extern GtkWidget *wid_h12;
+extern GtkWidget *wid_itm;
+extern GtkWidget *wid_locale;
 
-int selected_row;
+extern int selected_row;
 
 gint list_unsel_cb (GtkCList *clist,
         gint row,
diff -Naur wmclockmon-0.8.1.orig/wmclockmon-config/actions.c wmclockmon-0.8.1/wmclockmon-config/actions.c
--- wmclockmon-0.8.1.orig/wmclockmon-config/actions.c	2005-06-15 15:55:27.000000000 +0200
+++ wmclockmon-0.8.1/wmclockmon-config/actions.c	2020-02-24 22:32:59.929329239 +0100
@@ -19,6 +19,24 @@
 #include "edit.h"
 #include "actions.h"
 
+GtkWidget *application;
+GtkWidget *alarmlist;
+GtkWidget *wid_backlight;
+GtkWidget *wid_blink;
+GtkWidget *wid_styledir;
+GtkWidget *wid_stylename;
+GtkWidget *wid_color;
+GtkWidget *wid_command;
+GtkWidget *wid_msgcmd;
+GtkWidget *wid_h12;
+GtkWidget *wid_clk;
+GtkWidget *wid_itm;
+GtkWidget *wid_bin;
+GtkWidget *wid_locale;
+GtkWidget *wid_showcal;
+GtkWidget *wid_calalrms;
+
+int selected_row;
 
 void quit_app() {
     FREE(command);
diff -Naur wmclockmon-0.8.1.orig/wmclockmon-config/edit.c wmclockmon-0.8.1/wmclockmon-config/edit.c
--- wmclockmon-0.8.1.orig/wmclockmon-config/edit.c	2005-06-15 15:55:27.000000000 +0200
+++ wmclockmon-0.8.1/wmclockmon-config/edit.c	2020-02-24 22:30:01.651270068 +0100
@@ -16,6 +16,8 @@
 static GtkWidget *wid_date;
 static GtkWidget *wid_mesg;
 
+char *newalarm;
+
 void set_data(GtkWidget *widget, GtkWidget *data) {
     char *wstat = gtk_entry_get_text(GTK_ENTRY(GTK_COMBO(wid_status)->entry));
     char *wtime = gtk_entry_get_text(GTK_ENTRY(wid_time));
diff -Naur wmclockmon-0.8.1.orig/wmclockmon-config/edit.h wmclockmon-0.8.1/wmclockmon-config/edit.h
--- wmclockmon-0.8.1.orig/wmclockmon-config/edit.h	2005-06-15 15:55:27.000000000 +0200
+++ wmclockmon-0.8.1/wmclockmon-config/edit.h	2020-02-24 22:29:53.652267413 +0100
@@ -5,7 +5,7 @@
 #ifndef EDIT_H
 #define EDIT_H
 
-char *newalarm;
+extern char *newalarm;
 
 void edit_dialog(const char *title,
         int on,
diff -Naur wmclockmon-0.8.1.orig/wmclockmon-config/mainwindow.h wmclockmon-0.8.1/wmclockmon-config/mainwindow.h
--- wmclockmon-0.8.1.orig/wmclockmon-config/mainwindow.h	2005-06-15 15:55:27.000000000 +0200
+++ wmclockmon-0.8.1/wmclockmon-config/mainwindow.h	2020-02-24 22:33:31.864339834 +0100
@@ -7,24 +7,24 @@
 
 #include <gtk/gtk.h>
 
-GtkWidget *application;
-GtkWidget *alarmlist;
-GtkWidget *wid_backlight;
-GtkWidget *wid_blink;
-GtkWidget *wid_styledir;
-GtkWidget *wid_stylename;
-GtkWidget *wid_color;
-GtkWidget *wid_command;
-GtkWidget *wid_msgcmd;
-GtkWidget *wid_h12;
-GtkWidget *wid_clk;
-GtkWidget *wid_itm;
-GtkWidget *wid_bin;
-GtkWidget *wid_locale;
-GtkWidget *wid_showcal;
-GtkWidget *wid_calalrms;
+extern GtkWidget *application;
+extern GtkWidget *alarmlist;
+extern GtkWidget *wid_backlight;
+extern GtkWidget *wid_blink;
+extern GtkWidget *wid_styledir;
+extern GtkWidget *wid_stylename;
+extern GtkWidget *wid_color;
+extern GtkWidget *wid_command;
+extern GtkWidget *wid_msgcmd;
+extern GtkWidget *wid_h12;
+extern GtkWidget *wid_clk;
+extern GtkWidget *wid_itm;
+extern GtkWidget *wid_bin;
+extern GtkWidget *wid_locale;
+extern GtkWidget *wid_showcal;
+extern GtkWidget *wid_calalrms;
 
-int selected_row;
+extern int selected_row;
 
 gint list_unsel_cb (GtkCList *clist,
         gint row,
diff -Naur wmclockmon-0.8.1.orig/wmclockmon-config/tools.c wmclockmon-0.8.1/wmclockmon-config/tools.c
--- wmclockmon-0.8.1.orig/wmclockmon-config/tools.c	2005-06-15 15:55:27.000000000 +0200
+++ wmclockmon-0.8.1/wmclockmon-config/tools.c	2020-02-24 22:28:02.883230608 +0100
@@ -17,6 +17,21 @@
 #include <sys/types.h>
 #include "configfile.h"
 
+int    backlight;
+int    switch_authorized;
+int    h12;
+int    time_mode;
+int    use_leds;
+int    use_locale;
+int    showcal;
+int    calalrms;
+char  *style_name;
+char  *style_dir;
+char  *config_file;
+char  *light_color;
+char  *command;
+char  *msgcmd;
+Alarm *alarms;
 
 int fexist(const char *filename) {
     FILE *file;
diff -Naur wmclockmon-0.8.1.orig/wmclockmon-config/variables.h wmclockmon-0.8.1/wmclockmon-config/variables.h
--- wmclockmon-0.8.1.orig/wmclockmon-config/variables.h	2005-06-15 15:55:27.000000000 +0200
+++ wmclockmon-0.8.1/wmclockmon-config/variables.h	2020-02-24 22:18:40.479043297 +0100
@@ -7,20 +7,20 @@
 
 #include "defines.h"
 
-int    backlight;
-int    switch_authorized;
-int    h12;
-int    time_mode;
-int    use_leds;
-int    use_locale;
-int    showcal;
-int    calalrms;
-char  *style_name;
-char  *style_dir;
-char  *config_file;
-char  *light_color;
-char  *command;
-char  *msgcmd;
-Alarm *alarms;
+extern int    backlight;
+extern int    switch_authorized;
+extern int    h12;
+extern int    time_mode;
+extern int    use_leds;
+extern int    use_locale;
+extern int    showcal;
+extern int    calalrms;
+extern char  *style_name;
+extern char  *style_dir;
+extern char  *config_file;
+extern char  *light_color;
+extern char  *command;
+extern char  *msgcmd;
+extern Alarm *alarms;
 
 #endif