It compiled without problem. You can just follow the INSTALL file instructions, perhaps going to the INSTALL file for your particular platform but the TL;DR for the Mac is
./configure --with-ns make sudo make install
Then (for the Mac) you have to drag Emacs.app in the
nextstep directory to
/Applications. It almost takes less time to do it than it does to describe the process.
When I brought the new Emacs up, I had two problems (at least so far). First, it wasn't loading
ace-window because it couldn't find the file, even though it was there. I deleted it from ELPA and then readded it and it worked again.
Second, I have Emacs configured to split the frame horizontally so that I have two side by side windows when I start. The frame split during initialization but then killed one of the windows so that I had a single wide window. I solved that by setting disabling
It still remembers my open buffers across invocations so it's just like it was before. This is no doubt because of the new session-saving features: I'll have to investigate it more later.
This is my second post written in Emacs 24.4 and as you can see it's working just fine. I doubt any Irreal Emacsers need the reminder but you should definitely upgrade. It's really easy, even if you compile from source.
UPDATE: If you want to use
eww, there's an extra step you need to do on OS X. I wrote about it here.