--- a/src/ports.c
+++ b/src/ports.c
@@ -37,6 +37,16 @@
 #define LIST_WIDTH 200
 #define LIST_HEIGHT 100
 
+extern unsigned long sample_rate;
+extern jack_client_t * client;
+extern const char ** ports_in;
+extern const char ** ports_out;
+
+extern jack_port_t * in_L_port;
+extern jack_port_t * in_R_port;
+extern jack_port_t * out_L_port;
+extern jack_port_t * out_R_port;
+
 
 extern GtkWidget * ports_button;
 
--- a/src/sound.c
+++ b/src/sound.c
@@ -44,6 +44,16 @@
  */
 /* #define REVERBED_CALC_FLOAT */
 
+unsigned long sample_rate;
+jack_client_t * client;
+const char ** ports_in;
+const char ** ports_out;
+
+jack_port_t * in_L_port;
+jack_port_t * in_R_port;
+jack_port_t * out_L_port;
+jack_port_t * out_R_port;
+
 
 extern int client_running;
 extern REVTYPE * curr;
--- a/src/sound.h
+++ b/src/sound.h
@@ -24,15 +24,15 @@
 
 
 
-unsigned long sample_rate;
-jack_client_t * client;
-const char ** ports_in;
-const char ** ports_out;
-
-jack_port_t * in_L_port;
-jack_port_t * in_R_port;
-jack_port_t * out_L_port;
-jack_port_t * out_R_port;
+extern unsigned long sample_rate;
+extern jack_client_t * client;
+extern const char ** ports_in;
+extern const char ** ports_out;
+
+extern jack_port_t * in_L_port;
+extern jack_port_t * in_R_port;
+extern jack_port_t * out_L_port;
+extern jack_port_t * out_R_port;
 
 void comp_coeffs(void);
 void load_revtype_data(void);