为什么我的openCL构建在OS X上失败？

我在OS X 10.7 Lion上安装了所有的开发工具,但是当我在一个相对简单的程序上运行GCC时,只需要对clCreateProgramFromsource之类的openCL函数进行几次调用,我得到以下错误列表：

Undefined symbols for architecture x86_64:
  "_CreateContext",referenced from:
    _build_kernel in ccFuZymI.o
  "_GetDevices",referenced from:
    _build_kernel in ccFuZymI.o
  "_CreateCommandQueue",referenced from:
    _build_kernel in ccFuZymI.o
  "_clCreateProgramWithsource",referenced from:
    _build_kernel in ccFuZymI.o
  "_clBuildProgram",referenced from:
    _build_kernel in ccFuZymI.o
  "_clCreateKernel",referenced from:
    _build_kernel in ccFuZymI.o
  "_clCreateBuffer",referenced from:
    _build_kernel in ccFuZymI.o
  "_clEnqueueWriteBuffer",referenced from:
    _sync_run_kernel in ccFuZymI.o
  "_clSetKernelArg",referenced from:
    _sync_run_kernel in ccFuZymI.o
  "_clEnqueuEndRangeKernel",referenced from:
    _sync_run_kernel in ccFuZymI.o
  "_clEnqueueReadBuffer",referenced from:
    _sync_run_kernel in ccFuZymI.o
  "_clReleaseContext",referenced from:
    _destroy_kernel in ccFuZymI.o
  "_clReleaseCommandQueue",referenced from:
    _destroy_kernel in ccFuZymI.o
  "_clReleaseMemObject",referenced from:
    _destroy_kernel in ccFuZymI.o
  "_clReleaseProgram",referenced from:
    _destroy_kernel in ccFuZymI.o
  "_clReleaseKernel",referenced from:
    _destroy_kernel in ccFuZymI.o
ld: symbol(s) not found for architecture x86_64

还有一些其他警告,但在计算阶段没有其他错误.这是(如果不清楚)链接器错误.它似乎能够在创建目标文件时看到头文件中的定义,因为它给了我关于不兼容指针类型的警告.

我曾尝试粘贴到xcode项目中,但我得到了完全相同的错误.我试过only other OS X Lion / OpenCL result’s solution,但没有用.

$gcc -Wall foo.c -framework OpenCL -o foo