/in/foo.c: In function 'main':
/in/foo.c:4:3: warning: implicit declaration of function 'printt' [-Wimplicit-function-declaration]
   printt("11111 22222");
   ^
/tmp/ccWDwqhL.o: In function `main':
foo.c:(.text.startup+0xc): undefined reference to `printt'
collect2: error: ld returned 1 exit status