Don't do this.
Yesterday, I started testing a method to open only the required library, meaning that if someone compiles a program using V61 SDK, and that program only uses V48 functions, the program will only require ixemul.library V48. that's nice/best, isn't it? 
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yes this work, when the libc and crt0.o from V48 is used.
but the arguments are from PPC side, if a program want install ixemul lib V61(from installer), MOS or OS4 show a requester if they should replace the library because existing is V49 and new is V61.
so i should not have a libnum over V49
of course thats not good argument, because there are no ixemul programs that install ixemul lib in lib folder with a installer.ixemul programs need no installer.i know only cubic ide with installer, but this install lib in a seperate folder on later search path.only is the ppc libnum is not good enough this lib is used.
also the correct issue is that MOS or OS4 print on install a warning, if the user want overwrite the library with a higher 68k Version, this can make problems.
win vista for example bring such a requester when you want install a XP driver.
But to say 68k libs should not have more features that need of course a libnum increase, or they should rename is really bad.