diff -up psiconv-0.9.8/program/psiconv/psiconv.c.me psiconv-0.9.8/program/psiconv/psiconv.c
--- psiconv-0.9.8/program/psiconv/psiconv.c.me	2020-02-24 15:34:30.817159188 +0100
+++ psiconv-0.9.8/program/psiconv/psiconv.c	2020-02-24 15:35:12.055538713 +0100
@@ -48,6 +48,8 @@ static void print_help(void);
 static void print_version(void);
 static void strtoupper(char *str);
 
+psiconv_list fileformat_list; /* of struct psiconv_fileformat */
+
 void print_help(void)
 {
   fileformat ff;
diff -up psiconv-0.9.8/program/psiconv/psiconv.h.me psiconv-0.9.8/program/psiconv/psiconv.h
--- psiconv-0.9.8/program/psiconv/psiconv.h.me	2020-02-24 15:33:41.433704713 +0100
+++ psiconv-0.9.8/program/psiconv/psiconv.h	2020-02-24 15:34:05.254923935 +0100
@@ -52,7 +52,7 @@ typedef struct fileformat_s {
   output_function *output;
 } *fileformat;
 
-psiconv_list fileformat_list; /* of struct psiconv_fileformat */
+extern psiconv_list fileformat_list; /* of struct psiconv_fileformat */
 
 
 #endif /* PSICONV_H */