/home/E0DkNd/ccydseDd.o: In function `main':
prog.c:(.text.startup+0x34): undefined reference to `getop'
prog.c:(.text.startup+0x63): undefined reference to `push'
prog.c:(.text.startup+0x6b): undefined reference to `getop'
prog.c:(.text.startup+0x89): undefined reference to `pop'
prog.c:(.text.startup+0xa8): undefined reference to `pop'
prog.c:(.text.startup+0xb7): undefined reference to `push'
prog.c:(.text.startup+0xc1): undefined reference to `pop'
prog.c:(.text.startup+0xcc): undefined reference to `pop'
prog.c:(.text.startup+0xd7): undefined reference to `push'
prog.c:(.text.startup+0xe1): undefined reference to `pop'
prog.c:(.text.startup+0xec): undefined reference to `pop'
prog.c:(.text.startup+0xf7): undefined reference to `push'
prog.c:(.text.startup+0x101): undefined reference to `pop'
prog.c:(.text.startup+0x10c): undefined reference to `pop'
prog.c:(.text.startup+0x117): undefined reference to `push'
prog.c:(.text.startup+0x121): undefined reference to `pop'
collect2: error: ld returned 1 exit status