OK, one of my problems was that I did not notice that Emacs itself has org in its lisp directory. So I had two versions.
So I started again and did a fresh install of Emacs but I also had a version installed in my ~/.emacs.d/elpa and then I installed a third version in site-lisp Of cours, that way I got an messy installation. I am cleaning up now. When I try to build from the git version, I now get an error: In toplevel form: org-special-blocks.el:40:1:Error: Cannot open load file: org-html Compiling /Users/neuwirth/devel/org-mode/lisp/org-version.el... This happened after I removed the original list/org that came with Emacs. What can I do about that? Do I need to keep the org files that came with Emacs?