The configuration failed

[eapo]

• on Linux eT450s 5.15.0-56-generic #62~20.04.1-Ubuntu SMP Tue Nov 22 21:24:20 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
• with the config.log ~ pixeldrain

[prasadlakmal]

I faced the same issue, this is happening because pkg-config cannot locate the diodon.pc
You could confirm it by running this command; pkg-config --atleast-version=1.6.0 --print-errors diodon

As a workaround I did;

• Uninstalled the package diodon that I installed through apt install
• Built diodon from the source
• python2 ./waf configure --libdir /usr/lib/x86_64-linux-gnu
• python2 ./waf build

During the build, it couldn't locate diodon.h so I had to manually copy it from the built source (diodon/builddir/libdiodon)

For some reasons, the plugins were not applied to the app I built from the source, so at this point, I had to uninstall diodon. and install it again from the distro's package repo.
Then

sudo ./waf install
sudo update-icon-caches /usr/share/icons/hicolor/

and Profit!