Thanks Dave,
following the tutorial everything ended up well.
posqtgresql-contrib installation, sql upload script and tsearch2-driver pkg installation
I missed only the enable part, i'll decide later what packages i should add.
is it also a search for members? I can't test it isn't enable yet.
That would be great. Then I don't need to create a specific one or even adapt the one oacs has in the users-administration module.