[systmkor@darknet stop_and_wait_proj2]$ make rcopy
gcc -g -Wall -Werror -MD safe.c -o safe.o
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.6.1/../../../../lib/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: ld returned 1 exit status
make: *** [safe.o] Error 1