I ran make to create the examples and they work without problems.
Then I tried following example code - http://svn.clifford.at/tools/trunk/examples/cldemo.c - which resulted in an error message: " OpenCL Error: ‘clGetDeviceIDs(NULL, CL_DEVICE_TYPE_GPU, 100, devices, &devices_n)’ returned -32! "
How can I solve this problem? What steps do you recommend to debug?