Problem building boost serialization library

[gpn02]

Hi,
I am using BCB 6 and the installation of the boost libraries skips libboost_serialization.lib, the very one I need.

It shows :

(...)
Building Boost.Regex with the optional Unicode/ICU support disabled.
Please refer to the Boost.Regex documentation for more information
(and if you don't know what ICU is then you probably don't need it).
**** spirit 1.6x required to build library with this compiler ****
**** skipping build of <@boost!libs!serialization!build>libboost_serialization.lib; toolset= borland variant= debug ****
**** spirit 1.6x required to build library with this compiler ****
(...)

I already downloaded spirit 1.63xx and included the spirit folder in all the path of the BCB compiler, but boost installation always displays the same error "spirit 1.6x required to build library "

Can someone help with this ?
Thank you 

[Robert Ramey]

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Try setting the environmental variable 

set SPIRIT_ROOT=c:/spirit16

or something similer