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Homepage: https://www.graphviz.org/ https://gitlab.com/graphviz/graphviz/
Description: Open Source Graph Visualization Software
Fixed: Bug 638026 - media-gfx/graphviz-2.40.1: Add Qt5 support https://bugs.gentoo.org/638026
but on some system:
#error Qt requires a C++11 compiler and yours does not seem to be that
# export CXXFLAGS=-std=c++11
# emerge -a1 media-gfx/graphviz
error Qt requires a C++11 compiler https://forums.gentoo.org/viewtopic-t-1065532-start-0.html