MarsSeed [1] filed a deletion request for mingw-w64-netcdf-cxx-legacy [2]: Unused legacy library from 2018. I propose deletion, as nothing depends on this version.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/mingw-w64-netcdf-cxx-legacy/
