1093i3511 [1] filed a deletion request for perl-netcdf [2]: Sources don't resolve, upstream url isn't reachable anymore. Unidata discontinued active maintenance and support of this perl module to access scientific data via the netCDF API.
[1] https://aur.archlinux.org/account/1093i3511/ [2] https://aur.archlinux.org/pkgbase/perl-netcdf/
