--- a/main.c
+++ b/main.c
@@ -12,6 +12,9 @@
 
 #include <siphon.h>
 
+char *device, *logfile;
+int verbose, back;
+
 void usage (char *);
 void title(void);
 
--- a/siphon.h
+++ b/siphon.h
@@ -51,5 +51,5 @@
 void *parse (void *);
 void *siphon_log(void *);
 
-char *device, *logfile;
-int verbose, back;
+extern char *device, *logfile;
+extern int verbose, back;