undefined reference to `calloc'这个错误怎么解决

xwxwxw123

make过程中发生错误，日志如下：
$ make
cc -fPIC -o vector.o -c vector.c
vector.c:1: warning: -fPIC ignored for target (all code is position independent)
cc -fPIC -o command.o -c command.c
command.c:1: warning: -fPIC ignored for target (all code is position independent)
cc -fPIC -o buffer.o -c buffer.c
buffer.c:1: warning: -fPIC ignored for target (all code is position independent)
cc -fPIC -o vty.o -c vty.c
vty.c:1: warning: -fPIC ignored for target (all code is position independent)
ar r libzebvty.a vector.o command.o buffer.o vty.o
ar: creating libzebvty.a
ld -x --shared -o libzebvty.so vector.o command.o buffer.o vty.o
vector.o:vector.c.text+0x17): undefined reference to `calloc'
vector.o:vector.c.text+0x61): undefined reference to `calloc'
请大师们帮忙！！

Sorehead

#include <stdlib.h>

xwxwxw123

包括了这个头文件了啊
#include <stdlib.h>
#include <unistd.h>

#include "vector.h"
#include "memory.h"

churchmice

没有链接libc?

xwxwxw123

应该不是吧，加了-lc也不行啊
对了，我用的是cygwin，跟这个有关系嘛