Poxy looks for Libxml2 which is not installed by default on Windows

[wroyca]

"C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32019\bin\HostX86\x64\cl.exe" /c /nologo /O2 /W3 /GL /DNDEBUG /MD -I/usr/include/libxml2 "-IC:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32019\include" "-IC:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32019\ATLMFC\include" "-IC:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Auxiliary\VS\include" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.22000.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0.22000.0\\um" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0.22000.0\\shared" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0.22000.0\\winrt" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0.22000.0\\cppwinrt" /TcC:\Users\wroy\AppData\Local\Temp\xmlXPathInitxjkf60b1.c /FoUsers\wroy\AppData\Local\Temp\xmlXPathInitxjkf60b1.obj
      xmlXPathInitxjkf60b1.c
      C:\Users\wroy\AppData\Local\Temp\xmlXPathInitxjkf60b1.c(1): fatal error C1083: Cannot open include file: 'libxml/xpath.h': No such file or directory
      error: command 'C:\\Program Files\\Microsoft Visual Studio\\2022\\Preview\\VC\\Tools\\MSVC\\14.35.32019\\bin\\HostX86\\x64\\cl.exe' failed with exit code 2
      *********************************************************************************
      Could not find function xmlCheckVersion in library libxml2. Is libxml2 installed?
      *********************************************************************************
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.

Can be fixed by installing lxml-4.9.0-cp311-cp311-win_amd64.whl from https://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml

[marzer]

Huh? lxml is listed as a requirement in requirements.txt, and is included by the pip install script. This likely isn't a bug in poxy, but something amiss with your local python environment.

[marzer]

Actually, wait. This suggests otherwise. Well, I'm confused; I use windows as my daily driver and haven't run into this O_O

[marzer]

Ah, that page lists the binary page you've linked above. I see now 😅

Not sure what a good solve for this is, since I can't automate that in the installer (I don't think). I guess just documenting it?

[wroyca]

Ah, that page lists the binary page you've linked above. I see now 😅

Not sure what a good solve for this is, since I can't automate that in the installer (I don't think). I guess just documenting it?

Seems reasonable :)

[marzer]

Hmmn, the lxml docs say this:

If you fail to build lxml on your MS Windows system from the signed and tested sources that we release, consider using the binary builds from PyPI [...]

I'm confused about what this is saying. To me this means pip install lxml should do the right thing on windows? That tracks with my experience so far, at least, but I'm not sure if this is a case of correlation and not causation...

[wroyca]

I tried but it didn't work, I ended up with more gibberish errors. Unfortunately, I don't have the logs anymore, but it may be worth trying again

[marzer]

it may be worth trying again

Yup. I'd like to test this on a 'clean room' PC at some point, one that I haven't been doing any dev tasks on - I'm concerned that all my use of Poxy on windows has always been on machines that I've also done dev stuff on and may have accidently installed the libxml prerequisites through some other means.

[wroyca]

No longer the case, closing. :)