C:\src\boost>jam -sBOOST_ROOT=c:\src\boost -sTOOLS=msvc-stlport
don't know how to make <python-library@>python21.lib
...patience...
...found 1807 targets...
...updating 854 targets...
...can't find 1 target...
...can't make 42 targets...
msvc-C++-action libs\regex\build\bin\libboost_regex.lib\msvc-stlport\debug\runtime-link-dynamic\stlport-iostream-off\stlport-version-4.0\c_regex_traits.obj
The system cannot find the path specified.
'C:\Program' is not recognized as an internal or external command,
operable program or batch file.

    CALL "C:\Program Files\Microsoft Visual C++\VC98\bin\VCVARS32.BAT" >nul
    C:\Program Files\Microsoft Visual C++\VC98\bin\cl  /Zm400 -nologo -GX -c  -DBOOST_REGEX_NO_LIB=1 -DBOOST_REGEX_STATIC_LINK=1 -D__STL_NO_SGI_IOSTREAMS=1 -D__STL_DEBUG=1 -D__STL_DEBUG_UNINITIALIZED=1  /Zi /Od /Ob0 /GX /GR /MDd   -I"libs\regex\build" -I"c:\src\boost"  -I"\stlport"  -Fo"libs\regex\build\bin\libboost_regex.lib\msvc-stlport\debug\runtime-link-dynamic\stlport-iostream-off\stlport-version-4.0\c_regex_traits.obj"  -Tp"libs\regex\build\../src\c_regex_traits.cpp"

...failed msvc-C++-action libs\regex\build\bin\libboost_regex.lib\msvc-stlport\debug\runtime-link-dynamic\stlport-iostream-off\stlport-version-4.0\c_regex_traits.obj ...
msvc-C++-action libs\regex\build\bin\libboost_regex.lib\msvc-stlport\debug\runtime-link-dynamic\stlport-iostream-off\stlport-version-4.0\c_regex_traits_common.obj
The system cannot find the path specified.
'C:\Program' is not recognized as an internal or external command, operable program or batch file.

    CALL "C:\Program Files\Microsoft Visual C++\VC98\bin\VCVARS32.BAT" >nul
    C:\Program Files\Microsoft Visual C++\VC98\bin\cl  /Zm400 -nologo -GX -c  -DBOOST_REGEX_NO_LIB=1 -DBOOST_REGEX_STATIC_LINK=1 -D__STL_NO_SGI_IOSTREAMS=1 -D__STL_DEBUG=1 -D__STL_DEBUG_UNINITIALIZED=1  /Zi /Od /Ob0 /GX /GR /MDd   -I"libs\regex\build" -I"c:\src\boost"  -I"\stlport"  -Fo"libs\regex\build\bin\libboost_regex.lib\msvc-stlport\debug\runtime-link-dynamic\stlport-iostream-off\stlport-version-4.0\c_regex_traits_common.obj"  -Tp"libs\regex\build\../src\c_regex_traits_common.cpp"

...failed msvc-C++-action libs\regex\build\bin\libboost_regex.lib\msvc-stlport\debug\runtime-link-dynamic\stlport-iostream-off\stlport-version-4.0\c_regex_traits_common.obj ...
msvc-C++-action libs\regex\build\bin\libboost_regex.lib\msvc-stlport\debug\runtime-link-dynamic\stlport-iostream-off\stlport-version-4.0\cpp_regex_traits.obj
The system cannot find the path specified.
'C:\Program' is not recognized as an internal or external command,operable program or batch file.

    CALL "C:\Program Files\Microsoft Visual C++\VC98\bin\VCVARS32.BAT" >nul
    C:\Program Files\Microsoft Visual C++\VC98\bin\cl  /Zm400 -nologo -GX -c  -DBOOST_REGEX_NO_LIB=1 -DBOOST_REGEX_STATIC_LINK=1 -D__STL_NO_SGI_IOSTREAMS=1 -D__STL_DEBUG=1 -D__STL_DEBUG_UNINITIALIZED=1  /Zi /Od /Ob0 /GX /GR /MDd   -I"libs\regex\build" -I"c:\src\boost"  -I"\stlport"  -Fo"libs\regex\build\bin\libboost_regex.lib\msvc-stlport\debug\runtime-link-dynamic\stlport-iostream-off\stlport-version-4.0\cpp_regex_traits.obj"  -Tp"libs\regex\build\../src\cpp_regex_traits.cpp"


(and much much more of the same)