media-gfx/graphviz

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https://bugs.gentoo.org/buglist.cgi?quicksearch=media-gfx/graphviz
https://packages.gentoo.org/packages/media-gfx/graphviz

Homepage: https://www.graphviz.org/ https://gitlab.com/graphviz/graphviz/
Description: Open Source Graph Visualization Software

Troubleshooting

Qt5

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

Fixed with:
# 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