I want to get the .vmem file according to my test program. I tried to replace to contents of or1200-cbasic.c file with my test program : #include , it has funtions sprintf, fputc, fputs. Then i make it : make rtl-test TEST=or1200-cbasic. But there were some errors : undefined refrence to 'fputc' / 'fputs' / 'sprintf'. So, how can i fixed it? Can anybody help me!