Hello,<div><br></div><div>When building on OS X with the 10.4 SDK selected, only g++ version 4.0 can be used. This is the case when compiling on 10.4 or 10.5, since there &quot;g++&quot; is a symlink to &quot;g++-4.0&quot;. But when compiling on 10.6, &quot;g++&quot; defaults to &quot;g++-4.2&quot;, and so compiling with macosx-version=10.4 fails (standard C++ library headers for 4.2 are not present in the 10.4 SDK). One solution is for user to modify user-config.jam and explicitly specify gcc version, but that seems a bit inconvenient if the build system can make that decision itself (because in the described case it&#39;s not a matter of choice, but necessity).</div>


<div><br></div><div>My bjam language knowledge is very low, so I tried to make a &quot;patch&quot; which &quot;shows what should be done&quot;, maybe someone (Volodya?) could modify it to make it actually work (and so that I can test it)?</div>




<div><br></div><div>Thanks,</div><div>Boris</div>