Any use of 1_31_0_rc2 with python2.3 gives: /usr/include/python2.3/pyconfig.h:847:1: warning: "_POSIX_C_SOURCE" redefined In file included from /usr/include/limits.h:26, from /usr/lib/gcc-lib/i386-redhat-linux/3.3.2/include/limits.h:122, from /usr/lib/gcc-lib/i386-redhat-linux/3.3.2/include/syslimits.h:7, from /usr/lib/gcc-lib/i386-redhat-linux/3.3.2/include/limits.h:11, from /usr/local/src/boost_1_31_0_rc2/boost/python/detail/wrap_python.hpp:27, from /usr/local/src/boost_1_31_0_rc2/boost/python/detail/prefix.hpp:13, from /usr/local/src/boost_1_31_0_rc2/boost/python/class.hpp:9, from /usr/local/src/boost_1_31_0_rc2/boost/python/suite/indexing/indexing_suite.hpp:10, from /usr/local/src/boost_1_31_0_rc2/boost/python/suite/indexing/vector_indexing_suite.hpp:10, from Test.cc:1: