The following repository access (RA) modules are available:
* ra_svn : Module for accessing a repository using the svn network protocol.
- handles 'svn' scheme
* ra_local : Module for accessing a repository on local disk.
- handles 'file' scheme
* ra_serf : Module for accessing a repository via WebDAV protocol using serf.
- using serf 1.3.9 (compiled with 1.3.9)
- handles 'http' scheme
- handles 'https' scheme
The Subversion project does not provide binaries, so you should report this to whomever or wherever you obtained them. You are right that it looks like they were not built properly and/or did not include all of the libraries needed for http support.