Thank you, uwe, I should have looked for a more appropriate list.
$ nm -D /lib/libc.so | grep sigaction ~/July.2023
0000000000099c18 T __libc_sigaction14
0000000000099c18 W __sigaction14
0000000000099dd4 T __sigaction_sigtramp
0000000000084dbc T sigaction
for completeness
# nm -D /lib/libc.so | grep sigaction /usr/crap/src.old/sys/arch/evbarm/conf
0000000000099c18 T __libc_sigaction14
0000000000099c18 W __sigaction14
0000000000099dd4 T __sigaction_sigtramp
0000000000084dbc T sigaction
It is *missing* __sigaction_siginfo (!)
I have no idea what gives (how that happened), nor how to fix it.
Thanks much,
Mike