librecad in the main tree calls -std=c++11, which is named -std=c++0x under gcc 4.6 branch. Patch to librecad is attached but I'm not proficient enough (right now) with ebuilds to produce the ebuild patch itself. Reproducible: Always
Created attachment 368612 [details, diff] patch to the librecad project file for the correct option Note that gcc 4.7, 4.8, and 4.9_alpha (toolchain overlay) will not see any difference whether the standard passed is c++11 or c++0x.