CircleCI: Install autoconf.
CircleCI: Install autoconf.

Frankly I'm puzzled.  The build failed, saying aclocal-1.15 was missing
on the system.  Why is this needed when just running the pre-made
configure script?

jtv/libpqxx,jtv/libpqxx,jtv/libpqxx,jtv/libpqxx