Karel Maesen, in 5.0 branch, I only see the following in lib/spatial (in addition to hibernate-spatial):

1. apfloat-1.8.2.jar
2. geolatte-geom-1.0.4.jar
3. jts-1.13.jar
4. postgresql-8.4-701.jdbc4.jar
5. slf4j-api-1.6.1.jar

This jira will only address master and 5.1 branches. Please open a new jira for 5.0.