This brings it into line with the Windows and Linux libraries.
This is a universal dylib with x86_64, i386 and ppc parts. However, even on a 64 bit Intel machine Mono can only P/INVOKE the i386 version right now. ppc is untested.
The configuration used to compile was
CFLAGS="-g -O2 -isysroot /Developer/SDKs/MacOSX10.6.sdk -arch i386 -arch x86_64 -arch ppc" CXXFLAGS="-g -O2 -isysroot /Developer/SDKs/MacOSX10.6.sdk -arch i386 -arch x86_64 -arch ppc" LDFLAGS="-arch i386 -arch x86_64 -arch ppc" ./configure --enable-old-trimesh --disable-asserts --enable-shared --disable-dependency-tracking --disable-demos --without-x
--disable-demos --without-x is required to build ODE on Mac OS X
CFLAGS, CXXFLAGS and --disable-dependency-tracking are necessary to build the universal dylib (some compilation lines use CFLAGS instead of CXXFLAGS)
The other settings are tweaks for using ODE with OpenSim
