If you install PostgreSQL from the PostgreSQL Yum Repository RPM packages, you may encounter the following error when running pg_probackup3:

libpq.so.5: no version information available

These packages replace the system default version of the libpq library and may cause applications (not just pg_probackup3) to malfunction.

To resolve this problem, switch the system back to using the standard libpq version by running the following commands:

alternatives --install /etc/ld.so.conf.d/postgresql-pgdg-libs.conf pgsql-ld-conf /dev/null 1320
alternatives --set pgsql-ld-conf /dev/null
ldconfig