Hi, I'd like to try a tiny change to the CDATA class. In order to try, I have to be able to build lxml. Unfortunately, on Windows. I've downloaded Visual Studio 2019 CE. I created a (Python 3.12) virtual environment, where I installed Cython (latest version). I cloned lxml sources from GitHub. I then opened a "Developer command prompt for VS 2019", activated the virtual environment, and typed: (.venv) C:\Temp\lxml\lxml>python setup.py build_ext -i --with-cython --static-deps This downloads the dependencies like libxml2 etc.; this goes without problems. Then compilation starts, and gives errors: [...] Creating library build\temp.win32-cpython-312\Release\src\lxml\etree.cp312-win_amd64.lib and object build\temp.win32-cpython-312\Release\src\lxml\etree.cp312-win_amd64.exp etree.obj : error LNK2001: unresolved external symbol _xmlStrchr etree.obj : error LNK2001: unresolved external symbol _xmlIOParseDTD etree.obj : error LNK2001: unresolved external symbol _xmlMemShow [...] There are in total 503 unresolved externals. I checked the first one, and find that is is present in the downloaded libxml2_a.lib, but without the underscore. The directories of the downloaded libraries are correctly added to the compiler command line. I am out of my depth here. I hope someone is willing to help me proceed. Kind regards, Gertjan.