[Boost-users] Alternative to bjam threading=multi

On AIX I want to compile with multi-threading, then means using xlC_r. Using bjam threading=multi Will do this. However is there a way achieving the same effect without putting "threading=multi" on the command line ? i.e putting the threading model in site-config.jam In my site-config.jam , have tried the following, all to no avail *using* xlc : : xlC_r ; using vacpp : : <threading>multi ; using vacpp : xlC_r ; Best regards, Ta, Avi