[postgis-devel] could not load library /usr/lib/postgresl/liblwgeom.so.1.1

[BIBIS, Bohnebeck, Uta]

Hello,
I have installed postgresql (version 8.1.2) and are now trying to install
postgis (version 1.1.1) on a linux machine
and receive the following error message:

contrib/postgis-1.1.1> psql -U postgres -d test -f lwpostgis.sql
BEGIN
psql:lwpostgis.sql:45: NOTICE:  type "histogram2d" is not yet defined
psql:lwpostgis.sql:45: ERROR:  could not access file
"$libdir/liblwgeom.so.1.1": No such file or directory
psql:lwpostgis.sql:50: ERROR:  current transaction is aborted, commands
ignored until end of transaction block
...

After modifying the variable $libdir to the path /usr/lib/postgresql
the file was found but nethertheless the library is not loaded.

contrib/postgis-1.1.1> psql -U postgres -d test -f lwpostgis.sql
BEGIN
psql:lwpostgis.sql:45: NOTICE:  type "histogram2d" is not yet defined
psql:lwpostgis.sql:45: ERROR:  could not load library
"/usr/lib/postgresql/liblwgeom.so.1.1":
/usr/lib/postgresql/liblwgeom.so.1.1: undefined symbol: nth
psql:lwpostgis.sql:50: ERROR:  current transaction is aborted, commands
ignored until end of transaction block
...

Any ideas to solve this problems?

Best regards,
Uta