Yes, i can see how thats important for a project like mplayer... and i appreciate your no-compromise approach to development!
Since i no longer have an OS2006 device to test on (or vm with which i could target it), i don't know if the bora build would work on there but perhaps since the app depends on gtk it is very OS-specific. Assuming bora build doesnt work on OS2006, someone with a gregale SDK scratchbox environment might try downloading the source code and doing standard :
My setup package is likely unorthodox to linux purists such as yourself, so honestly anyone who would have a use for it would probably pick better file system structure.