Error while creating manpage `pkgctl-db-move(1)`

Steps to reproduce:

1. git clone git@gitlab.archlinux.org:archlinux/devtools.git && cd devtools
2. Run make
3. Run make install

   install: cannot stat 'build/doc/man/pkgctl-db-move.1': No such file or directory

4. Try to open the manpage for it

   $ man pkgctl-db-move
   No manual entry for pkgctl-db-move