Hello Mike, Can you email me the files that you have created for your Hello World example in Code Crusader? In the meantime, ensure that that you surround the header file as shown below: #include <iostream.h> In the Make.header file, type in: -lstdc++ LOADLIBES := -lstdc++ -lm Note that l is a charcter not a number. Cheers! -- Roman Registered Linux User #179293 High Energy Penguin Powered Email