/in/foo.c: In function 'main':
/in/foo.c:17:3: warning: implicit declaration of function 'prinf' [-Wimplicit-function-declaration]
   prinf("No");
   ^~~~~
/tmp/cconY8uh.o: In function `main':
foo.c:(.text.startup+0x50): undefined reference to `prinf'
collect2: error: ld returned 1 exit status