linking error with : reads c compiler from rigel

From: Jan Goormans (
Date: 05/01/04

Date: 1 May 2004 09:51:43 -0700

I included cSio51.h for folowing functions :
   - putc (puts a character on screen)
   - getc (gets a character from input)
   - PrtDec (prints an intiger in decimal on screen)
   - printf (print a string of characters on screen)
When i call one of these functions and compile the file, i get an linking error

Is there a replacement function for scanf (or to read a string)