'apt build-dep emacs' has unmet dependencies

[VanL]

Hello,

The other day I was able to run,

        sudo apt build-dep emacs

then configure, build, install Emacs-28 from git repo.

After reflashing the Raspbian Debian Buster image for RPi4B, the package
install command does the following,

,----
| % sudo apt build-dep emacs
| [sudo] password for xxx: 
| Reading package lists... Done
| Reading package lists... Done
| Building dependency tree       
| Reading state information... Done
| Some packages could not be installed. This may mean that you have
| requested an impossible situation or if you are using the unstable
| distribution that some required packages have not yet been created
| or been moved out of Incoming.
| The following information may help to resolve the situation:
| 
| The following packages have unmet dependencies:
|  builddeps:emacs : Depends: librsvg2-dev but it is not going to be installed
|                    Depends: libgtk-3-dev but it is not going to be installed
|                    Depends: libasound2-dev but it is not going to be installed
|                    Depends: libmagick++-6.q16-dev but it is not going to be 
installed
| E: Unable to correct problems, you have held broken packages.
`----

What needs to happen, or I wait for the packages to find a working
state?  I am not using the unstable distrib.

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