Hi, As I need a build of Python3 compatible with VS2012, I built it from scratch and installed it in a _INSTALL folder, following a tutorial online. Now, I want to use that Python3 with Boost.Python, so I did this in my use-config.jam: using python : 3.4 : D:/Tools/Python-3.4.5/_INSTALL/python.exe : D:/Tools/Python-3.4.5/_INSTALL/include : D:/Tools/Python-3.4.5/_INSTALL/libs ; And then: .\bootstrap.bat --with-python=D:\Tools\Python-3.4.5\_INSTALL --with-python-version=3.4 --python-buildid=3 which failed. The includes are found properly, but the link is floawed: LINK : fatal error LNK1104: cannot open file 'python34.lib' The library is in D:/Tools/Python-3.4.5/_INSTALL/libs, but could not be found according to the log. Also, something strange: D:\Tools\boost_1_60_0\tools\build\src\engine>.\bootstrap\jam0 -f build.jam --toolset=vc14 "--toolset-root=C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\Tools\..\..\VC\ " --with-python=D:\Tools\Python-3.4.5\_INSTALL --with-python-version=3.4 --python-buildid=3 The retrieved toolset is wrong, as explicitely asked for VS2012 aka 11.0 int he user-config.jam and I'm running it from a VS2012 x64 native tools command prompt. Couldn't find any help online, so the best is to ask the Boost community! Regards, Matthieu -- Information System Engineer, Ph.D. Blog: http://blog.audio-tk.com/ LinkedIn: http://www.linkedin.com/in/matthieubrucher