The 3rd and final problem.
make -C tools/cbridge
make[1]: Entering directory '/home/bill/Downloads/Computers/Emulation/simh/PDP-10/ITS/its/tools/cbridge'
cc -c -g -o cbridge.o cbridge.c
In file included from cbridge.c:96:
cbridge.h:90:10: fatal error: openssl/ssl.h: No such file or directory
90 | #include
| ^~~~~~~
compilation terminated.
This was fixed by…
sudo apt-get install libssl-dev
At last it finished without bombing!