--- bt.h.orig   Thu Sep  5 10:21:18 2002
+++ bt.h        Thu Sep  5 10:22:45 2002
@@ -47,7 +47,9 @@
 #define LD_ERROR 98
  
 extern char * strdup();
+#if !defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(_bsdi__)
 extern char * realloc();
+#endif
 #define set_str(x, new)\
 	if (x) free(x); \
 	 if (new) x = strdup(new); \
