Hi I am trying to create the boost libraries with toolset vc-7_1-stlport. STLPort 4.6.2 has been installed Successfully and runs fine on the system ( VC .Net2003 C++7.1). The problem is that only the multi-threaded libaries are being created. The single threaded (dynamic and static) are not being genereated. I also read on earlier posts a few problems with wchar_t. So I modified the vc71.mak file of STLPort4.6.2 to add /Zc:wchar_t and then recompiled STLPort. I also changed the Vc-7_1-stlport-tools.jam file to look like #feature native-wchar_t : off on ; feature native-wchar_t : on off ; Since the Multi-threaded libraries are being built, I assume I do not have the wchar_t problem. The bjam command I use is: bjam "-sTOOLS=vc-7_1-stlport" "-sSTLPORT_VERSION=4.6.2" "-sSTLPORT_4.6.2_PATH=C:\SourceLibrary\STLport-4.6.2" "-sBUILD=debug release <runtime-link>static/dynamic <threading>single/multi <stlport-iostream>on <native-wchar_t>on" install On one of the boost.regex pages it is written : Note that the full STLPort libraries appear not to support single-thread static builds.... If it is not possible to create single threaded static builds then how to use the boost multi-threaded date_time libraries with the STLport libraries??? Any help is much appreciated. Manish Mangal Stratagen Systems 1-425.821.8454 ext. 136