This ${prefix}/share/vendor-completion convention seems to be debian
specific, so leave the global default alone for now.
usr/bin/notmuch
usr/bin/notmuch-emacs-mua
usr/share/bash-completion
usr/bin/notmuch
usr/bin/notmuch-emacs-mua
usr/share/bash-completion
+usr/share/zsh/vendor-completions
--mandir=/usr/share/man \
--infodir=/usr/share/info \
--sysconfdir=/etc \
--mandir=/usr/share/man \
--infodir=/usr/share/info \
--sysconfdir=/etc \
+ --zshcompletiondir=/usr/share/zsh/vendor-completions \
--localstatedir=/var
override_dh_auto_build:
--localstatedir=/var
override_dh_auto_build: