diff -Naur bc-1.06/lib/number.c bc-1.06-p/lib/number.c
--- bc-1.06/lib/number.c	2000-10-03 20:34:25.000000000 +0200
+++ bc-1.06-p/lib/number.c	2008-05-17 17:22:28.000000000 +0200
@@ -35,6 +35,7 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <ctype.h>/* Prototypes needed for external utility routines. */
+#include <string.h>
 
 #define bc_rt_warn rt_warn
 #define bc_rt_error rt_error