build failure: AppFileName should be set to something after SVMain!

[Terrence Enger]

Hello, all,

Several local builds in succession have failed with 
messages like:

    [GAL] education
    warn:vcl:23225:23225:vcl/source/app/svapp.cxx:237: AppFileName should be set to something after
SVMain!
    Bootstrap exception 'component context fails to supply service
com.sun.star.ucb.UniversalContentBroker of type com.sun.star.ucb.XUniversalContentBroker'
    make[1]: *** [/home/terry/lo_hacking/git/libo6/solenv/gbuild/Gallery.mk:58:
/home/terry/lo_hacking/git/libo6/workdir/Gallery/diagrams.done] Error 1

The failures occur varying numbers of times and below 
different values for [GAL]...

Suggestions welcome.

Thank you, all, for your attention.
Terry.