I&#39;m trying to build boost on a 64-bit  CentOS 5.4 install.  I have Python 2.6.4 built and installed at /opt/Python_2.6.4/, and I&#39;ve appended the user-config.jam file with:<br /><br />using python : 2.6 : /opt/Python_2.6.4/python : /opt/Python_2.6.4/Include : /opt/Python_2.6.4/Lib ;<br /><br />The standard system Python is 2.4.1 but the tools I&#39;m using require 2.6, so I&#39;ve built this version and installed it independently of the system version 2.4.1 to avoid any conflicts.<br /><br />As I&#39;m sure you&#39;ve already imagined, I get the error:<br /><br />LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)<br /><br />I see that this is a long standing bug, but I have yet to find a fix.  I&#39;ve tried various CCFLAGS, CXXFLAGS, etc. to push for a 64-bit compile or a 32-bit compile (-m64 or -m32). <br /><br />The offending file is pyport.h - is there a 64-bit friendly version that I don&#39;t know about?<br /><br />-Kirk