Hi :-)
As it seems that nobody noticed it, the last setpatch version "setpatch 44.38 (08/03/02)" from OS3.9 Boing Bag 2 has integrated the fonctionalities of MMULib's 680x0.library, thus making automatic recognition of the cpu installed , either 68030, 040 or 060, and loading/initializing the right library for it.
Thus we no longer have to use fake 68040.library or MMUlib's 680x0.library replacement :-D
Since, I have only the 68060.library from MMULib v43.6 package in Libs:, and It's perfectly working for me :-)
Amigalement,
Jean-François Bachelet, Amiga ONLY since 1985.