MarsSeed [1] filed a deletion request for katecpp-helper-plugin [2]: Hey @arcanis and AUR TU's, I suggest this discontinued and now broken helper plugin can be deleted. It cannot be built because it's missing a KDE SDK for Kate editor which no longer exists. Latest tagged release was in 2014, last development commit was in 2017. It only supported up to C++ 14 source code syntax. It's not needed anymore. Since 1 Jan 2020 Kate has an integrated LSP (Language Server Protocol) client plugin, via which the editor can access helper modules for a large list of programming/markup languages. C and C++ syntax support comes from clang/LLVM as was the case with this plugin, but now it supports the latest C++17 as well, and of course it will fully support C++20 standard once it matures. https://kate-editor.org/post/2020/2020-01-01-kate-lsp-client-status/ [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/katecpp-helper-plugin/