Vladimir, I have some fixes for the program_options library on Win32 for you, first off here's the problem: On Win32 you must use the a dynamic runtime if you are building or using a dll: if you don't do this then separate runtimes/memory managers etc get linked to each module and the result is almost always a runtime crash some point. However you are also using std::locale and so have added std::facet-support std::locale-support to your build requirements. Doing so however, causes the static runtime to be used, so you're in a bit of a catch-22 situation here I'm afraid. You've also failed to define BOOST_ALL_DYN_LINK when *using* your dll - this is causing the mscv link failures. The patches below address both of these issues, tested with: VC7.1: everything passes. VC7.0: everything passes except the tests that use \u (unsupported). Intel 8 on vc7.1: everything passes. Intel 7.1 on vc7.1 everything pases except the tests that use \u (unsupported). Borland 5.6.4: all tests pass. Borland 5.5.1: Internal compiler error in function from_8bit, haven't investigated further yet. The fact that these tests do pass with Intel, possibly means that std::facet-support could be deprecated - it looks like Intel have fixed that problem with their recent patches. However, you may still experience problems with Metrowerks - I think there is any way around this - the dll version of the library is going to be unusable with that compiler. One final thing: you declare the environ variable in your sources, which is leading to warnings from MSVC and Intel about conflicting dll-specifications for that variable, perhaps you should include the header required rather than defining the variable yourself (unistd.h when BOOST_HAS_UNISTD_H is defined, or stdlib.h on WIN32)? John Index: build/Jamfile =================================================================== RCS file: /cvsroot/boost/boost/libs/program_options/build/Jamfile,v retrieving revision 1.2 diff -u -r1.2 Jamfile --- build/Jamfile 18 May 2004 06:38:17 -0000 1.2 +++ build/Jamfile 14 Jul 2004 10:32:56 -0000 @@ -21,7 +21,7 @@ <define>BOOST_ALL_DYN_LINK=1 # tell source we're building dll's <runtime-link>dynamic # build only for dynamic runtimes <include>$(BOOST_ROOT) <sysinclude>$(BOOST_ROOT) - std::facet-support std::locale-support + #std::facet-support std::locale-support : debug release # build variants ; cvs diff: Diffing doc cvs diff: Diffing example cvs diff: Diffing src cvs diff: Diffing test Index: test/Jamfile =================================================================== RCS file: /cvsroot/boost/boost/libs/program_options/test/Jamfile,v retrieving revision 1.4 diff -u -r1.4 Jamfile --- test/Jamfile 28 Jun 2004 09:31:28 -0000 1.4 +++ test/Jamfile 14 Jul 2004 10:32:56 -0000 @@ -19,7 +19,9 @@ run $(name).cpp <dll>../build/boost_program_options <lib>../../test/build/boost_test_exec_monitor : : : <include>$(BOOST_ROOT) - std::facet-support std::locale-support + #std::facet-support std::locale-support + <define>BOOST_ALL_DYN_LINK=1 + <runtime-link>dynamic : $(name)_dll ] ; }