I'm running OS X Leopard on an intel Macbook. I was able to muddle through getting 1.34.1 built universal. In order to build Boost universal, I followed the instructions I stumbled upon here: http://woldlab.caltech.edu/cgi-bin/mussa/wiki/OSXUniversalDependencies I modified it slightly to build with the OS 10.5 sdk. I have appended my user-config.jam file. I am interested in using ASIO, which depends upon Boost.System. Boost.System is not included in 1.34.1, but it is included in the ASIO download. I can build and have built system according to the instructions in the ASIO README, but these instructions result in an i386 only build. Any ideas how I can build and install Boost.System universal with 1.34.1? Or, is there a better way altogether? Thanks in advance. Derrick ##### user-config.jam # Boost.Build Configuration # Automatically generated by Boost configure # Compiler configuration using darwin : 4.0 : g++-4.0 : <cflags>"-isysroot /Developer/SDKs/MacOSX10.5.sdk -arch ppc -arch i386" <linkflags>"-Wl,-syslibroot,/Developer/SDKs/MacOSX10.5.sdk -arch ppc -arch i386" ; # Python configuration using python : 2.4 : /Library/Frameworks/Python.framework/Versions/2.4 ; ##### end user-config.jam