foo.c: In function 'main':
foo.c:7:6: warning: implicit declaration of function 'scnaf' [-Wimplicit-function-declaration]
C:\Users\ADMINI~1\AppData\Local\Temp\1\cckPIqTR.o:foo.c:(.text.startup+0x30): undefined reference to `scnaf'
collect2.exe: error: ld returned 1 exit status