"make check" failed on 8.4.2 install

Hi,

I am trying to upgrade to 8.4.2 but my usual compile from source failed

$ ./configure --prefix=/usr/local/pgsql_8.4 --with-pgport=6235 --with-perl --with-openssl
--with-libraries=/usr/local/ssl/lib/--with-includes=/usr/local/ssl/include/ 
$ make
$ make check

......
============== shutting down postmaster               ==============
/usr/local/install/postgresql-8.4.2/src/test/regress/./tmp_check/install//usr/local/pgsql_8.4/bin/pg_ctl: relocation
error:/usr/local/install/postgresql-8.4.2/src/test/regress/./tmp_check/install//usr/local/pgsql_8.4/lib/libpq.so.5:
undefinedsymbol: dlopen 

pg_regress: could not stop postmaster: exit code was 32512
make[2]: *** [check] Error 2
make[2]: Leaving directory `/usr/local/install/postgresql-8.4.2/src/test/regress'
make[1]: *** [check] Error 2
make[1]: Leaving directory `/usr/local/install/postgresql-8.4.2/src/test'
make: *** [check] Error 2

Server details:

adam@testing:/usr/local/install/postgresql-8.4.2$ uname -a
Linux testing 2.6.14.7 #1 SMP Fri Jan 19 11:55:40 GMT 2007 i686 unknown

8.3.5 passed ok, but the 8.4.* seem to fail on my system. Presumably i need to upgrade something else to work with
8.4.*?Does anybody have any idea which? 

thanks for any help

adam