Hi 1) I want to do some modifications in source code. After that modifictions, must I install gcc again to use modified gcc? Isn't there any short method? 2) Can I use printf function in (internal)source files of gcc? ___________________________________________________________ Yahoo! Mail is the world's favourite email. Don't settle for less, sign up for your free account today http://uk.rd.yahoo.com/evt=44106/*http://uk.docs.yahoo.com/mail/winter07.html