autotools on MacOS (and maybe anywhere else) doesn't build gvedit with QT6
Steps to reproduce
brew install qt@6
./autogen.sh; ./configure --with-qt blablabla
make install
You may need to edit configure.ac to refer to Qt6* instead of Qt5*. The build succeeds, without gvedit
Additional info
In the configure script, the probe for Qt6Core fails because it relies on pkg-config. Qt6 dropped support for pkg-config as they rely on Cmake dependencies instead.
Although graphviz has a working rough draft of a Cmake build, it doesn't include gvedit either.
I wonder if we wait long enough, some kind stranger will make a pkg-config compatibility layer for Qt6. I'm sure we're not the only project that faces this.