missing file

[halogen2]

Try

sudo apt-get install libunistring2/focal

[him610]

OK, making some progress. These three commands were successful ....

$ sudo apt-get install libunistring2/focal
...
~/build/libunistring$ apt-cache policy libunistring2
...
sudo apt-get install libunistring-dev

However, another fatal error - missing file similar to the one documented in post #1.

hugh@b450m:~/build/boxes-master$ make && make test
| For compilation info please refer to the boxes compilation FAQ
| at https://boxes.thomasjensen.com/docs/faq.html#q5
make -C src BOXES_PLATFORM=unix LEX=flex YACC=bison build
make[1]: Entering directory '/home/hugh/build/boxes-master/src'
make -C ../out -f ../src/Makefile BOXES_PLATFORM=unix ALL_OBJ="parser.o lex.yy.o boxes.o cmdline.o discovery.o generate.o input.o list.o parsecode.o parsing.o query.o regulex.o remove.o shape.o tools.o unicode.o" \
    CFLAGS_ADDTL="-O " STRIP=true flags_unix boxes
make[2]: Entering directory '/home/hugh/build/boxes-master/out'
make[2]: Nothing to be done for 'flags_unix'.
gcc -I. -I../src -Wall -W -O    -c -o parser.o parser.c
In file included from boxes.h:35,
                 from ../src/parser.y:27:
../src/regulex.h:42:10: fatal error: pcre2.h: No such file or directory
   42 | #include <pcre2.h>
      |          ^~~~~~~~~
compilation terminated.
make[2]: *** [<builtin>: parser.o] Error 1
make[2]: Leaving directory '/home/hugh/build/boxes-master/out'
make[1]: *** [Makefile:54: build] Error 2
make[1]: Leaving directory '/home/hugh/build/boxes-master/src'
make: *** [Makefile:41: build] Error 2

I will close this thread as solved since the original missing file issue was successfully addressed. I will also follow the posts in this thread while attempting to address the current missing file.

@halogen2 You have been so helpful and patient as we worked through this issue. Thank you. Should we ever meet in person, the beer or coffee (your choice) is on me. Have a nice day, you earned it