phrasen.c: In function `main':
phrasen.c:161: warning: return type of 'main' is not `int'
/tmp/ccW1wSMZ.o: In function `getch':
phrasen.c:(.text+0x7): undefined reference to `readchar'
/tmp/ccW1wSMZ.o: In function `main':
phrasen.c:(.text+0x34): undefined reference to `randomize'
collect2: ld returned 1 exit status