/in/foo.c: In function 'main':
/in/foo.c:15:4: warning: implicit declaration of function 'prinf' [-Wimplicit-function-declaration]
    prinf("%d\n",i);
    ^~~~~
/tmp/ccca4ogC.o: In function `main':
foo.c:(.text.startup+0x6c): undefined reference to `prinf'
collect2: error: ld returned 1 exit status