Use PCRE explicitly. If PCRE was installed, the header of PCRE was
picked upped. However, since there was bash-ism in the configure
script, libpcre was not linked, correctly. As the result, the regex
in our libc was used, but the header of PCRE was referred.
Update to 2.3.9.
Upgrading from 2.3.8
* The default value of the allowplaintext option has been changed to
disabled (0). If you need to allow cleartext passwords on the wire,
then you will have to explicitly enable the allowplaintext option