I realize that this bug was closed some time ago and I apologize for not speaking up sooner.  I am still unable to build current versions of Emacs 26 or the master branch on OSX 10.6.8 (server edition) absent using an earlier version of org-mode.

The same symptoms as described in the initial bug report still persist -- i.e., build freezes when byte-compiling org-timer.el:

 ELC      org/org-timer.elc

For those who have reported that the previous attempted fix was successful, perhaps there is a difference between retail OSX 10.6.8 and the server edition.  But, that's just a guess on my part.

Thanks,

Keith