Unfortunately the messages there don't actually mean much, but that specific failure mode means that something inside libreoffice code crashed while generating the gallery.
If you are using any abnormal configure switches I would try turning those off first and see if that helps.
Otherwise the only thing that can be done is
(1) run make to get it to build as far as possible
(2) run 'PARALLELISM=1 make verbose=t" to make it build and show you the commands it executes
(3) cut and paste the last command and edit it so you can run it using gdb
(4) run it using gdb and debug the failure
