gcc不能编译gdbm的程序

系统：Fedora10.0

程序：beginning linux programming chapter7 dbm1.c

报错：/tmp/cc4T13wv.o: In function `main':

dbm1.c:(.text+0x2d): undefined reference to `dbm_open'

dbm1.c:(.text+0x250): undefined reference to `dbm_store'

dbm1.c:(.text+0x2fb): undefined reference to `dbm_fetch'

dbm1.c:(.text+0x38a): undefined reference to `dbm_close'

collect2: ld returned 1 exit status

程序源代码如下：

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <ndbm.h>
#include <string.h>
#define TEST_DB_FILE "/tmp/dbm1_test"
#define ITEMS_USED 3
/* A struct to use to test dbm */
struct test_data {
    char misc_chars[15];
    int  any_integer;
    char more_chars[21];
};
int main() {
    struct test_data items_to_store[ITEMS_USED];
    struct test_data item_retrieved;
    char key_to_use[20];
    int i, result;
    datum key_datum;
    datum data_datum;
    DBM *dbm_ptr;
    dbm_ptr = dbm_open(TEST_DB_FILE, O_RDWR | O_CREAT, 0666);
    if (!dbm_ptr) {
        fprintf(stderr, "Failed to open database/n");
        exit(EXIT_FAILURE);
    }
        /* put some data in the structures */
    memset(items_to_store, '/0', sizeof(items_to_store));
    strcpy(items_to_store[0].misc_chars, "First!");
    items_to_store[0].any_integer = 47;
    strcpy(items_to_store[0].more_chars, "foo");
    strcpy(items_to_store[1].misc_chars, "bar");
    items_to_store[1].any_integer = 13;
    strcpy(items_to_store[1].more_chars, "unlucky?");
    strcpy(items_to_store[2].misc_chars, "Third");
    items_to_store[2].any_integer = 3;
    strcpy(items_to_store[2].more_chars, "baz");
    for (i = 0; i < ITEMS_USED; i++) {
            /* build a key to use */
        sprintf(key_to_use, "%c%c%d",
            items_to_store[i].misc_chars[0],
            items_to_store[i].more_chars[0],
            items_to_store[i].any_integer);
            /* build the key datum strcture */
        key_datum.dptr = (void *)key_to_use;
        key_datum.dsize = strlen(key_to_use);
        data_datum.dptr = (void *)&items_to_store[i];
        data_datum.dsize = sizeof(struct test_data);
        result = dbm_store(dbm_ptr, key_datum, data_datum, DBM_REPLACE);
        if (result != 0) {
            fprintf(stderr, "dbm_store failed on key %s/n", key_to_use);
            exit(2);
        }
    } /* for */
        /* now try and retrieve some data */
    sprintf(key_to_use, "bu%d", 13); /* this is the key for the second item */
    key_datum.dptr = key_to_use;
    key_datum.dsize = strlen(key_to_use);
    data_datum = dbm_fetch(dbm_ptr, key_datum);
    if (data_datum.dptr) {
        printf("Data retrieved/n");
        memcpy(&item_retrieved, data_datum.dptr, data_datum.dsize);
        printf("Retrieved item - %s %d %s/n",
               item_retrieved.misc_chars,
               item_retrieved.any_integer,
               item_retrieved.more_chars);
    }
    else {
        printf("No data found for key %s/n", key_to_use);
    }
    dbm_close(dbm_ptr);
    exit(EXIT_SUCCESS);
}

编译的时候使用的编译命令如下，引入/usr/include/gdbm头文件搜索路径，链接库文件gdbm

gcc -o dbm1 -I/usr/include/gdbm dbm1.c -lgdbm

但是编译不通过，查看了头文件ndbm.h里面的内容没有错的的，命名有声明这个几个函数，然后百度之后找到答案，需要链接一个gdbm_compat库才可以。使用命令如下，编译成功。

gcc -o dbm1 -I/usr/include/gdbm dbm1.c -lgdbm -lgdbm_compat