Gentoo's Bugzilla –
Attachment 348962 Details for
Bug 471062media-libs/opencv-2.4.5 with sys-libs/glibc-2.17 - Speedup: /usr/include/stdc-predef.h:40:1: warning: [...]/work/opencv-2.4.5_build/modules/videostab/precomp.hpp.gch/opencv_videostab_Gentoo.gch: not used because `NDEBUG' is defined [-Winva