Source: openMSX-devel mailinglist
Team openMSX have migrated their sources on Source Forge from CVS (Concurrent Versions System) to SVN (Subversion). This means that if you want to obtain the latest sources of openMSX, you will have to do that differently from now on. A howto can be found in the openMSX compilation guide.
Relevant link: openMSX on Sourceforge