Did you compile it from source from the Google Code repository? If the toolchain has been updated the older binary might not work. It has nothing to do with changing compilation flags.
I didn't even know there were a repository. And as cocosx mentions, I am one of those 'lazy' users that prefer prebuilt versions of software so I don't have to go through the hassle of VMs, compilation and telnet etc.
And he's also right about the GCW Zero. Sadly, to really take off, there is going to be a lot of 'helping' the general user base, because let's face it; people are lazy and just want things to work with a minimum of preparation and time invested.
I tried getting a better build of Meritous to run under OD end-user but never got it to work because of issues compiling arising as soon as I attempted to fix something.
The current build of Meritous is not playable because you'll get to the point in the game where you can't progress because it soft-hangs (you can't move).
The point where this problem arises is when the player tries to acquire the sword PSI key (which is the first one of three).
So I got another build for GP2X (if I remember correctly) where this issue was fixed, but I couldn't get it to compile properly for OD for some reason. My knowledge of compiling and so on is very limited, albeit I do know a thing or two.
Maybe I should try it again, I'm sure a lot of lazy people like me would be glad I did if I succeed...