1 files changed, 3 insertions, 2 deletions
diff --git a/newlib/libc/syscalls/syslink.c b/newlib/libc/syscalls/syslink.c
index 841684f46..327870769 100644
--- a/newlib/libc/syscalls/syslink.c
+++ b/newlib/libc/syscalls/syslink.c
@@ -1,11 +1,12 @@
 /* connector for link */
 
 #include <reent.h>
+#include <unistd.h>
 
 int
 _DEFUN (link, (old, new),
-     char *old _AND
-     char *new)
+     _CONST char *old _AND
+     _CONST char *new)
 {
   return _link_r (_REENT, old, new);
 }