Hello.
The project in 5.13.0+dfsg-10 does *not* fix #821278.
Indirect link dependencies must be added to this part:
> +TODO:
> + -- If options must be added to the command line after
> + -- -L$(Library_Dir) -l$(Library_Name) when linking an executable:
> + package Linker is
> + for Linker_Options use ("-lplplot", "-lor", "-lsomething", "-lsimilar");
> + end Linker;
> + -- Else remove all from TODO: to this line.
Depending on the situation, you may need a substitution variable,
as done above for DEB_HOST_MULTIARCH.
The autopkgtest would have reported this issue.
You should probably run it before uploading a new version.