undefined symbol: boot_DynaLoader

Hi,

We are getting the error:

12:32:58: ERROR: DB connect or query error is: ERROR: could not load
library "/opt/apps/backup/9.0SS/lib/postgresql/plperl.so":
/opt/apps/backup/9.0SS/lib/postgresql/plperl.so: undefined symbol:
boot_DynaLoader

[root(at)system postgresql-9.0.0]# ldd
/opt/apps/backup/9.0SS/lib/postgresql/plperl.so
linux-vdso.so.1 => (0x00007fff109cb000)
libperl.so => /lib64/libperl.so (0x00002b825ceba000)
libnsl.so.1 => /lib64/libnsl.so.1 (0x00002b825d1f1000)
libdl.so.2 => /lib64/libdl.so.2 (0x00002b825d409000)
libm.so.6 => /lib64/libm.so.6 (0x00002b825d60d000)
libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00002b825d891000)
libutil.so.1 => /lib64/libutil.so.1 (0x00002b825dac9000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00002b825dccc000)
libc.so.6 => /lib64/libc.so.6 (0x00002b825dee8000)
libresolv.so.2 => /lib64/libresolv.so.2 (0x00002b825e240000)
/lib64/ld-linux-x86-64.so.2 (0x0000003d3b000000)
[root(at)system postgresql-9.0.0]#

perl -v
This is perl 5, version 18, subversion 1 (v5.18.1) built for x86_64-linux

cat /etc/redhat-release
CentOS release 5.6 (Final)