In the unit tests I want conditionally run some unit-tests - depending on property <target-os>- On Windows systems the unit-test should apply/build with property <context- impl>winfib and on POSIX (non-Windows) <context-impl>ucontext. The Jamfile below doesn't work (Windows version build on POSIX) - xould I get a hint how to fix it (couldn't find a reference of rule 'run'). Oliver [ run test_callcc.cpp : : : <context-impl>fcontext [ requires cxx11_auto_declarations cxx11_constexpr cxx11_defaulted_functions cxx11_final cxx11_hdr_thread cxx11_hdr_tuple cxx11_lambdas cxx11_noexcept cxx11_nullptr cxx11_rvalue_references cxx11_template_aliases cxx11_thread_local cxx11_variadic_templates ] : test_callcc_fcontext ] [ run test_callcc.cpp : : : <context-impl>ucontext [ requires cxx11_auto_declarations cxx11_constexpr cxx11_defaulted_functions cxx11_final cxx11_hdr_thread cxx11_hdr_tuple cxx11_lambdas cxx11_noexcept cxx11_nullptr cxx11_rvalue_references cxx11_template_aliases cxx11_thread_local cxx11_variadic_templates ] : test_callcc_ucontext ] [ run test_callcc.cpp : : : <context-impl>winfib [ requires cxx11_auto_declarations cxx11_constexpr cxx11_defaulted_functions cxx11_final cxx11_hdr_thread cxx11_hdr_tuple cxx11_lambdas cxx11_noexcept cxx11_nullptr cxx11_rvalue_references cxx11_template_aliases cxx11_thread_local cxx11_variadic_templates ] : test_callcc_winfib : <target-os>windows ] ;