Hi~, i got a problem when i run my test program on orpsoc. i want to get the .vmem file according to my test program. The test program : tow 4X4 matrixs multiply then write the result matrix to a outputfile. I use fputs, fputc function. I tried to replace the code of or1200-cbasic.c file with my test code. and when i run program using command : make trl-test TEST=or1200-cbasic VCD=1, it reported some errors : undefined reference to `fopen'/ `fputs' / `fputc'. So, can anybody help me!