cmake --no-warn-unused-cli -C /var/tmp/portage/media-video/avidemux-2.5.6/temp/gentoo_common_config.cmake -DCMAKE_INSTALL_PREFIX=/usr -DAVIDEMUX_SOURCE_DIR='/var/tmp/portage/media-video/avidemux-2.5.6/work/avidemux_2.5.6' -DAVIDEMUX_INSTALL_PREFIX='/var/tmp/portage/media-video/avidemux-2.5.6/work/avidemux-2.5.6_build' -DAVIDEMUX_CORECONFIG_DIR='/var/tmp/portage/media-video/avidemux-2.5.6/work/avidemux-2.5.6_build/config' -Dgtk=ON -DGTK=ON -DGtk=ON -Dqt4=ON -DQT4=ON -DQt4=ON -DGETTEXT=ON -Dsdl=ON -DSDL=ON -DSdl=ON -DXVIDEO=ON -Dalsa=ON -DALSA=ON -DAlsa=ON -Desd=OFF -DESD=OFF -DEsd=OFF -Djack=OFF -DJACK=OFF -DJack=OFF -Doss=OFF -DOSS=OFF -DOss=OFF -DPULSEAUDIOSIMPLE=OFF -Daften=ON -DAFTEN=ON -DAften=ON -DLAME=ON -DFAAC=ON -DFAAD=ON -Dvorbis=ON -DVORBIS=ON -DVorbis=ON -DLIBDCA=ON -DOPENCORE_AMRNB=OFF -DOPENCORE_AMRWB=OFF -DFREETYPE2=ON -DFONTCONFIG=ON -Dxvid=ON -DXVID=ON -DXvid=ON -Dx264=ON -DX264=ON -DX264=ON -DCMAKE_BUILD_TYPE=Gentoo -DCMAKE_INSTALL_DO_STRIP=OFF -DCMAKE_USER_MAKE_RULES_OVERRIDE=/var/tmp/portage/media-video/avidemux-2.5.6/temp/gentoo_rules.cmake /var/tmp/portage/media-video/avidemux-2.5.6/work/avidemux_2.5.6 cmake: /usr/lib/gcc/x86_64-pc-linux-gnu/4.5.3/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by cmake) * ERROR: media-video/avidemux-2.5.6 failed (configure phase): * cmake failed Today (2012.02.04) reemerged gcc-4.5.3-r2 still provides GLIBCXX only up to GLIBCXX_3.4.14 (/usr/lib/gcc/x86_64-pc-linux-gnu/4.5.3/libstdc++.so.6.0.14), but media-video/avidemux-2.5.6 need GLIBCXX_3.4.15. When package was compiled with gcc-4.6.2 (/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.2/libstdc++.so.6.0.16) everything is OK, because GLIBCXX_3.4.15 is supported. So if it's impossible for gcc-4.5.3 upgrade support to GLIBCXX_3.4.15, then some test/warning about this gcc-4.5.3 issue in avidemux ebuild will be good. Reproducible: Always Steps to Reproduce: 1. Compile media-video/avidemux-2.5.6 with gcc-4.5.3. 2. 3. Actual Results: Compilation failed because gcc-4.5.3 doesn't support >=GLIBCXX_3.4.15. Expected Results: Compilation succeeded.
Switching from 4.6 to 4.5 after already building packages like, in your case, cmake, against 4.6 is not supported *** This bug has been marked as a duplicate of bug 297685 ***