Since a few days (maybe an emacs update) I get this error message whenever I run org-caldav-sync.
--8<---------------cut here---------------start------------->8--- Debugger entered--Lisp error: (void-function url-http-options) url-http-options("https://www.google.com/calendar/dav/0fseo5jbfp99polnfc6ic38...@group.calendar.google.com/events/") url-dav-supported-p("https://www.google.com/calendar/dav/0fseo5jbfp99polnfc6ic38...@group.calendar.google.com/events/") (or (and (boundp (quote url-dav-patched-version)) url-dav-patched-version) (url-dav-supported-p (org-caldav-events-url))) (if (or (and (boundp (quote url-dav-patched-version)) url-dav-patched-version) (url-dav-supported-p (org-caldav-events-url))) nil (error "You have to either use Emacs from bzr, or the patched `url-dav' package from the org-caldav repository.")) org-caldav-sync() call-interactively(org-caldav-sync record nil) command-execute(org-caldav-sync record) execute-extended-command(nil "org-caldav-sync") call-interactively(execute-extended-command nil nil) --8<---------------cut here---------------end--------------->8--- I've been digging around a bit and url-http-options is defined in url-http.el which is present on my system (/usr/share/emacs/24.3.50/lisp/url/url-http.el.gz) so I don't understand why it isn't found (assuming that void-function message actually means it can't find the definition of the function). Everything was working fine with org-caldav before and I was very happy with it. Thanks a lot to its developper. Julien.