$ sudo pacman -S libkgapi
resolving dependencies...
warning: cannot resolve "qt5-webengine", a dependency of "libkgapi" 
:: The following package cannot be upgraded due to unresolvable dependencies:
      libkgapi

affected dependency chain:

kde-development-environment-meta
kdepim-runtime -> kaddressbook -> kdepim-meta -> kde-applications-meta
               -> kalarm       -> kdepim-meta -> kde-applications-meta
               -> kmail        -> kdepim-meta -> kde-applications-meta
               -> knotes       -> kdepim-meta -> kde-applications-meta
               -> korganizer   -> kdepim-meta -> kde-applications-meta
               -> zanshin
kio-gdrive

this package is already in conflict with 'your-privacy' BTW
'kdepim-runtime' has a distinct verion in [nonprism] which does not depend on libkgapi
'kdepim-runtime' however, has another missing dependency 'libkolab' (issue #1861)