error: No best alternative for /python_for_extensions
    next alternative: required properties: <python>2.6 <target-os>linux
        matched
    next alternative: required properties: <python>2.6 <target-os>linux
        matched
error: No best alternative for /python_for_extensions
    next alternative: required properties: <python>2.6 <target-os>linux
        matched
    next alternative: required properties: <python>2.6 <target-os>linux
        matched
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/property.jam:613: in find-replace from module object(property-map)@1
error: Ambiguous key <target-type>PYTHON_EXTENSION <asynch-exceptions>off <debug-symbols>on <exception-handling>on <extern-c-nothrow>off <hardcode-dll-paths>true <host-os>linux <include>/home/hilboll/lib/build/boost_1_42_0 <inlining>off <install-dependencies>off <library>object(file-target)@713 <link>shared <main-target-type>PYTHON_EXTENSION <optimization>off <os>LINUX <pch>on <preserve-test-targets>on <profiling>off <python-debugging>off <python.interpreter>/usr/bin/python2.6 <python.interpreter>python <python>2.6 <rtti>on <runtime-debugging>on <runtime-link>shared <stdlib>native <suppress-import-lib>true <symlink-location>project-relative <target-os>linux <target>object(file-target)@730 <threadapi>pthread <threading>single <toolset-gcc:version>4.4.1 <toolset>gcc <user-interface>console <variant>debug <warnings-as-errors>off <warnings>on <xdll-path>/home/hilboll/lib/build/boost_1_42_0/bin.v2/libs/python/build/gcc-4.4.1/debug
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/property.jam:590: in object(property-map)@1.find from module object(property-map)@1
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/type.jam:335: in generated-target-ps-real from module type
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/type.jam:359: in generated-target-ps from module type
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/type.jam:270: in type.generated-target-suffix from module type
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/virtual-target.jam:511: in virtual-target.add-prefix-and-suffix from module virtual-target
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/virtual-target.jam:470: in _adjust-name from module object(file-target)@730
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/virtual-target.jam:253: in abstract-file-target.__init__ from module object(file-target)@730
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/virtual-target.jam:563: in object(file-target)@730.__init__ from module object(file-target)@730
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/kernel/class.jam:88: in class.new from module class
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/generators.jam:565: in generator.generated-targets from module object(gcc-linking-generator)@724
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/tools/builtin.jam:900: in linking-generator.generated-targets from module object(gcc-linking-generator)@724
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/tools/unix.jam:67: in generated-targets from module object(gcc-linking-generator)@724
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/generators.jam:462: in construct-result from module object(gcc-linking-generator)@724
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/generators.jam:415: in run-really from module object(gcc-linking-generator)@724
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/generators.jam:390: in generator.run from module object(gcc-linking-generator)@724
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/tools/builtin.jam:815: in linking-generator.run from module object(gcc-linking-generator)@724
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/tools/unix.jam:41: in unix-linking-generator.run from module object(gcc-linking-generator)@724
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/tools/gcc.jam:546: in object(gcc-linking-generator)@724.run from module object(gcc-linking-generator)@724
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/generators.jam:1004: in try-one-generator-really from module generators
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/generators.jam:1066: in try-one-generator from module generators
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/generators.jam:1282: in construct-really from module generators
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/generators.jam:1366: in generators.construct from module generators
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/targets.jam:1440: in construct from module object(typed-target)@520
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/targets.jam:1253: in object(typed-target)@520.generate from module object(typed-target)@520
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/targets.jam:710: in generate-really from module object(main-target)@538
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/targets.jam:682: in object(main-target)@538.generate from module object(main-target)@538
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build/targets.jam:258: in object(project-target)@515.generate from module object(project-target)@515
/home/hilboll/lib/build/boost_1_42_0/tools/build/v2/build-system.jam:704: in load from module build-system
/home/hilboll/lib/build/boost_1_42_0/libs/python/example/../../../tools/build/v2/kernel/modules.jam:283: in import from module modules
/home/hilboll/lib/build/boost_1_42_0/libs/python/example/../../../tools/build/v2/kernel/bootstrap.jam:142: in boost-build from module
/home/hilboll/lib/build/boost_1_42_0/libs/python/example/boost-build.jam:7: in module scope from module