how to Fix these Errors in Graphics?

[clarkjohnken]

When I compile my code it Generates following errors:
1. undefined reference to 'initgraph'
2. undefined reference to 'line'
3. undefined reference to 'line'
4. undefined reference to 'line'
5. undefined reference to 'closegraph'
6. [Error] Id returned 1 exit status.

[thmm]

If you are using Turbo C++, you need to add the graphics lib to your project.
http://www.softwareandfinance.com/Turbo_C/Graphics_initgraph.html

If you use sth. else please specify what you use.