--- a/parts.c
+++ b/parts.c
@@ -19,6 +19,7 @@
 
 #include "pwavecat.h"
 
+struct part *parttab[2];
 
 struct part *lookup_part(char *name)
 {
--- a/parts.h
+++ b/parts.h
@@ -12,7 +12,7 @@
 	struct part *nxtentr;
 	struct part *prventr;
 	}; 
-struct part *parttab[2];
+extern struct part *parttab[2];
 /* first element points to first entry, second element to last entry */
 
 #endif /* _PARTS_H_ */
--- a/pwavecat.c
+++ b/pwavecat.c
@@ -38,6 +38,9 @@
 //	DWORD data_length;		/* length of data */
 //	} wave_header;
 
+int debug_flag;
+int verbose_flag;
+
 int modus;
 int sample_fq;
 int byte_p_sec;
--- a/pwavecat.h
+++ b/pwavecat.h
@@ -12,20 +12,20 @@
 #include "wave_header.h"
 #include "parts.h"
 
-int debug_flag;
-int verbose_flag;
+extern int debug_flag;
+extern int verbose_flag;
 
-int sample_fq;
-int byte_p_sec;
-int byte_p_spl;
-int bit_p_spl;
-int modus;
-int have_format_flag;		// set if first wave header is read, now file format is set.
+extern int sample_fq;
+extern int byte_p_sec;
+extern int byte_p_spl;
+extern int bit_p_spl;
+extern int modus;
+extern int have_format_flag;		// set if first wave header is read, now file format is set.
 
 #define MAX_FILES			100
 #define BUFFER_SIZE			65536
 
-char *input_filename[MAX_FILES];
+extern char *input_filename[MAX_FILES];
 
 #define VERSION "0.4.5"