--- a/ginclude.h
+++ b/ginclude.h
@@ -22,8 +22,8 @@ struct FLAGS
      urg:1,
      ece:1,
      cwr:1;
-}
-f;
+};
+extern struct FLAGS f;
 
 struct CHECKS
 {
@@ -31,33 +31,33 @@ struct CHECKS
      data:1,		/* include payload */
      linkl:1,		/* work with datalink */
      debug:1;		/* enable debug mode */
-}
-ck;
+};
+extern struct CHECKS ck;
 
 struct MULTI
 {
    u_long number;
    u_long delay;
-}
-m;
+};
+extern struct MULTI m;
 
 struct ECN
 {
    u_int dscp:8;
    u_int ecn_ct:2;
    u_int ecn_ce:1;
-}
-ipv4_tos;
+};
+extern struct ECN ipv4_tos;
 
-u_long shost;
-u_long dhost;
-u_long seq;
-u_long ack;
-u_short id;
-u_short urgp;
-u_short tos;
+extern u_long shost;
+extern u_long dhost;
+extern u_long seq;
+extern u_long ack;
+extern u_short id;
+extern u_short urgp;
+extern u_short tos;
 
-char device[10];
-char data[128];
+extern char device[10];
+extern char data[128];
 
-u_char ebuf[LIBNET_ERRBUF_SIZE];
+extern u_char ebuf[LIBNET_ERRBUF_SIZE];
--- a/interface.h
+++ b/interface.h
@@ -20,47 +20,47 @@ GtkWidget* create_ECNWin (void);
 /* Define common Widget */
 
 /* MainWin */
-GtkWidget *iface_entry;
-GtkWidget *srcmac_entry;
-GtkWidget *dstmac_entry;
-GtkWidget *ethtype_combo;
-GtkWidget *ethtype_combo_entry;
-GtkWidget *DatalinkFrame;
+extern GtkWidget *iface_entry;
+extern GtkWidget *srcmac_entry;
+extern GtkWidget *dstmac_entry;
+extern GtkWidget *ethtype_combo;
+extern GtkWidget *ethtype_combo_entry;
+extern GtkWidget *DatalinkFrame;
 
-GtkWidget *srcaddr_entry;
-GtkWidget *dstaddr_entry;
-GtkWidget *ttl_entry;
-GtkWidget *id_entry;
-GtkWidget *tos_entry;
+extern GtkWidget *srcaddr_entry;
+extern GtkWidget *dstaddr_entry;
+extern GtkWidget *ttl_entry;
+extern GtkWidget *id_entry;
+extern GtkWidget *tos_entry;
 
-GtkWidget *srcport_entry;
-GtkWidget *dstport_entry;
-GtkWidget *flags_table;
-GtkWidget *syn_checkbutton;
-GtkWidget *fin_checkbutton;
-GtkWidget *push_checkbutton;
-GtkWidget *ack_checkbutton;
-GtkWidget *rst_checkbutton;
-GtkWidget *urg_checkbutton;
-GtkWidget *ece_checkbutton;
-GtkWidget *cwr_checkbutton;
-GtkWidget *seq_entry;
-GtkWidget *ack_entry;
-GtkWidget *win_entry;
-GtkWidget *urg_entry;
+extern GtkWidget *srcport_entry;
+extern GtkWidget *dstport_entry;
+extern GtkWidget *flags_table;
+extern GtkWidget *syn_checkbutton;
+extern GtkWidget *fin_checkbutton;
+extern GtkWidget *push_checkbutton;
+extern GtkWidget *ack_checkbutton;
+extern GtkWidget *rst_checkbutton;
+extern GtkWidget *urg_checkbutton;
+extern GtkWidget *ece_checkbutton;
+extern GtkWidget *cwr_checkbutton;
+extern GtkWidget *seq_entry;
+extern GtkWidget *ack_entry;
+extern GtkWidget *win_entry;
+extern GtkWidget *urg_entry;
 
 /* Info TextView */
-GtkWidget *TextView;
-GtkTextBuffer *TextBuffer;
-GtkWidget *VerticalScroll;
+extern GtkWidget *TextView;
+extern GtkTextBuffer *TextBuffer;
+extern GtkWidget *VerticalScroll;
 
 /* DataWin */
-GtkWidget *DataEntry;
+extern GtkWidget *DataEntry;
 
 /* Multi */
-GtkWidget *table2;
-GtkWidget *NumberEntryMulti;
-GtkWidget *DelayEntryMulty;
+extern GtkWidget *table2;
+extern GtkWidget *NumberEntryMulti;
+extern GtkWidget *DelayEntryMulty;
 
 /* ECN */
-GtkWidget *dscpEntry;
+extern GtkWidget *dscpEntry;
--- a/gfuncts.c
+++ b/gfuncts.c
@@ -19,9 +19,12 @@
 
 #include "interface.h"
 
+struct FLAGS f;
+struct CHECKS ck;
+struct MULTI m;
+
 /* private functions */
 int CheckValues();
-u_short datalen; /* data (tcp payload) lenght */
 
 int Initialize()
 {
@@ -139,6 +142,7 @@ int SendPacket()
    /* BEGIN of variables ' declaration */
    libnet_t *l;
    char *dataptr;
+   u_short datalen; /* data (tcp payload) lenght */
 
    u_short sport, dport;
    u_short flag=0x00;
--- a/interface.c
+++ b/interface.c
@@ -27,6 +27,47 @@
 #include "ginclude.h" /* define payload and multi options */
 #include "common.h"
 
+GtkWidget *iface_entry;
+GtkWidget *srcmac_entry;
+GtkWidget *dstmac_entry;
+GtkWidget *ethtype_combo;
+GtkWidget *ethtype_combo_entry;
+GtkWidget *DatalinkFrame;
+
+GtkWidget *srcaddr_entry;
+GtkWidget *dstaddr_entry;
+GtkWidget *ttl_entry;
+GtkWidget *id_entry;
+GtkWidget *tos_entry;
+
+GtkWidget *srcport_entry;
+GtkWidget *dstport_entry;
+GtkWidget *flags_table;
+GtkWidget *syn_checkbutton;
+GtkWidget *fin_checkbutton;
+GtkWidget *push_checkbutton;
+GtkWidget *ack_checkbutton;
+GtkWidget *rst_checkbutton;
+GtkWidget *urg_checkbutton;
+GtkWidget *ece_checkbutton;
+GtkWidget *cwr_checkbutton;
+GtkWidget *seq_entry;
+GtkWidget *ack_entry;
+GtkWidget *win_entry;
+GtkWidget *urg_entry;
+
+GtkWidget *TextView;
+GtkTextBuffer *TextBuffer;
+GtkWidget *VerticalScroll;
+
+GtkWidget *DataEntry;
+
+GtkWidget *table2;
+GtkWidget *NumberEntryMulti;
+GtkWidget *DelayEntryMulty;
+
+GtkWidget *dscpEntry;
+
 #define GLADE_HOOKUP_OBJECT(component,widget,name) \
   g_object_set_data_full (G_OBJECT (component), name, \
     gtk_widget_ref (widget), (GDestroyNotify) gtk_widget_unref)