Linker error: undefined reference to `_error'

[CSMG Sarma]

hi all,
The following code gives a linker error for error() function call on my cygwin setup

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <errno.h>

main()
{
	pid_t pid;
	
	int len = 100;
	int fd;
	
	char * buf;
	char arr[] = "thread1.c";

	fd = fopen(arr, "rw");
	if (fd == NULL)
		error(1, errno, "fopen Failed!");
	printf("file opened successfully\n");
	
	if (ftruncate(fd, len) == -1)
		error(1, errno, "ftruncate Failed!");
	printf("file truncated to length %d bytes\n", len);
	
	buf = mmap(0, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
	if (buf == (void *)-1)
		error(1, errno, "ftruncate Failed!");
	printf("MMAP successful!!\n");

	if (unlink(fd) == -1)
		error(1, errno, "Unlink Failed!");
	printf("file UNlinked\n");

	pid = fork();
	if (pid < 0)
		error(1, errno, "fork Failed!");
	else
	{
		if (pid == 0)
		{
			printf("child process sleeps\n");
			sleep(2);
			printf("child process Wakes\n");
			printf("child reads from memory:\n...%s....", buf);
			printf("child dies\n");
		}
		else
		{
			printf("Parent::accessing mapped file\n");
			strcpy(buf, "parent writes on the mapped memory");
		}
	}
	
}

The snapshot of the error is as follows:

/tmp/cceXgGbe.o:mmap1.c:(.text+0x69): undefined reference to `_error'
/tmp/cceXgGbe.o:mmap1.c:(.text+0xab): undefined reference to `_error'
/tmp/cceXgGbe.o:mmap1.c:(.text+0x120): undefined reference to `_error'
/tmp/cceXgGbe.o:mmap1.c:(.text+0x15b): undefined reference to `_error'
/tmp/cceXgGbe.o:mmap1.c:(.text+0x194): undefined reference to `_error'
collect2: ld returned 1 exit status

I might have missed selecting appropriate library during installation.
Can any one suggest me which library I have to look for.

cheers
Sarma