Gentoo's Bugzilla –
Attachment 383756 Details for
Bug 520724media-libs/opencv-2.4.9 with dev-util/nvidia-cuda-sdk-6.5.14 - .../work/opencv-2.4.9/modules/gpu/src/nvidia/core/NCVPixelOperations.hpp(51): error: a storage class is not allowed in an explicit specialization