I grabbed branch REL9_4_STABLE from git, and Robert got me a 9.4-specific patch. I rebuilt, installed, and postgres started up successfully! I did a bunch of checks, had our app run several thousand SQL queries against it, had a colleague check it out, and it looks good. Looking at top and ps, I don't see anything funny (e.g. no processes spinning cpu, etc), things look normal. Let me know if I can provide anything else.