Followed this great advice on installing RMagick and ImageMagick on CentOS, and at
checking whether build environment is sane... configure: error: newly created file is older than distributed files!
Check your system clock
Well, no problem with that clock but the solution is to touch the top-level files of your ImageMagick folder, so the above becomes
Update: Of course it was the clock. Shouldn’t have gotten one of those cheap old dedicated machines, but I want to compare it with VPS anyway. So I proceeded like this: http://www.cyberciti.biz/faq/howto-install-ntp-to-synchronize-server-clock/ and clock was off by a cool eight hours.