./configure成功后，,make总是报错，如下：
../../glx/.libs/libglx.a(glxdriswrast.o): In function `__glXDRIscreenProbe':
/home/zhangtt/xorg-server-1.5.1/glx/glxdriswrast.c:476: undefined reference to `dlopen'
/home/zhangtt/xorg-server-1.5.1/glx/glxdriswrast.c:483: undefined reference to `dlsym'
/home/zhangtt/xorg-server-1.5.1/glx/glxdriswrast.c:531: undefined reference to `dlclose'
/home/zhangtt/xorg-server-1.5.1/glx/glxdriswrast.c:485: undefined reference to `dlerror'
/home/zhangtt/xorg-server-1.5.1/glx/glxdriswrast.c:478: undefined reference to `dlerror'
../../glx/.libs/libglx.a(glxdriswrast.o): In function `__glXDRIscreenDestroy':
/home/zhangtt/xorg-server-1.5.1/glx/glxdriswrast.c:255: undefined reference to `dlclose'
collect2: ld returned 1 exit status
make[3]: *** [Xvfb] 错误 1
make[3]:正在离开目录 `/home/zhangtt/xorg-server-1.5.1/hw/vfb'
make[2]: *** [all] 错误 2
make[2]:正在离开目录 `/home/zhangtt/xorg-server-1.5.1/hw/vfb'
make[1]: *** [all-recursive] 错误 1
make[1]:正在离开目录 `/home/zhangtt/xorg-server-1.5.1/hw'
make: *** [all-recursive] 错误 1
root@ubuntu:/home/zhangtt/xorg-server-1.5.1#
这是为什么呢？麻烦了解的人给指点下阿
