just reporting, while trying to compile opencv from git on opensuse i got this error:

~/opencv/modules/core/src/hal_replacement.hpp:226:10: fatal error: 'custom_hal.hpp' file not found
#include "custom_hal.hpp"
         ^
1 error generated.

I found this file in the same folder:
~/opencv/modules/core/src/hal_replacement.hpp

When I symlinked it to custom_hal.hpp in the same folder it continued compiling.

gr
Arno