--- recycle.c.orig	Wed Dec  5 08:51:08 1990
+++ recycle.c	Wed Dec  4 23:42:53 1996
@@ -18,7 +18,11 @@
 #ifndef NO_RECYCLE
 /* this whole file would have be skipped if NO_RECYCLE is defined */
 
-extern long	lseek();
+#if BSD && (BSD >= 199306)
+# include <unistd.h>
+#else
+ extern long	lseek();
+#endif
 
 #define BTST(bitno, byte)	((byte) & (1 << (bitno)))
 #define BSET(bitno, byte)	((byte) |= (1 << (bitno)))