#207 Make fails

[Bulun]

Hi there!
I've followed the installation procedure for Debian-based system (I'm running Ubuntu 24.04 on a Rasberry Pi 3B), but the make process failed with the following error. Can you help me please?
Thanks!

make[3]: Entering directory '/home/bulun/cdesktopenv-code/cde/doc/en_US.UTF-8/help'
SGML_SEARCH_PATH=".:.." \
/usr/bin/ksh ../../../programs/dtdocbook/doc_utils/dtdocbook2sdl -H ../../../programs/dthelp/parser/pass2/parser/dthelp_htag2 -L en_US.UTF-8 \
-o Appmanager.sdl basename Appmanager.sdl .sdl/book.sgm
In entity PART included from Appmanager/book.sgm:53:0
onsgmls:/home/bulun/cdesktopenv-code/cde/programs/dtdocbook/sgml/docbook.dtd:72:30:W: duplicate declaration of parameter entity "local.notations"
dtdocbook2sdl fatal error:
Error processing book.out.292347.sdl by ../../../programs/dthelp/parser/pass2/parser/dthelp_htag2
make[3]: *** [Makefile:1317: Appmanager.sdl] Error 1
make[3]: Leaving directory '/home/bulun/cdesktopenv-code/cde/doc/en_US.UTF-8/help'
make[2]: *** [Makefile:448: all-recursive] Error 1
make[2]: Leaving directory '/home/bulun/cdesktopenv-code/cde/doc/en_US.UTF-8'
make[1]: *** [Makefile:455: all-recursive] Error 1
make[1]: Leaving directory '/home/bulun/cdesktopenv-code/cde/doc'
make: *** [Makefile:631: all-recursive] Error 1
bulun@HAL9000:~/cdesktopenv-code/cde$