Installing 7.1.3 is missing libssl.0.1

I have compiled and installed PostgreSQL 7.1.3 on RedHat7.0 Linux with gcc
3.0.2 and glibc 2.2.4 with no configure options. The build seems to run fine
but when I run the regression test I get

initdb failed

And the initdb error log says

The program
    '/usr/local/pgsql/bin/postgres'
needed by initdb does not belong to PostgreSQL version 7.1.3, or
there may be a configuration problem.

There doesn't seem to be much of a clue as to what is going wrong.