[boost] Boost.System support for Linux 2.4 kernel?

Hello Everyone, Is it possible to add compatibility for the Linux 2.4 kernel to the system library? The file boost/system/linux_error.hpp refers to a few macros/constants that are not defined for the linux 2.4 kernel. The exact names of the symbols are: EKEYEXPIRED, EKEYREJECTED, EKEYREVOKED ENOKEY. Is Linux 2.4 a supported platform for Boost? Thanks, Jeroen