Windows MSYS2 build failure: use of deprecated -lzlib over -lz

[Fredrick Brennan]

C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lzlib
collect2.exe: error: ld returned 1 exit status

When doing `pip install lxml` via the MINGW64 pip3 in a venv.

Quick fix:

$ ln -s /mingw64/lib/libz.a /mingw64/lib/libzlib.a
$ ln -s /mingw64/lib/libz.dll.a /mingw64/lib/libzlib.dll.a

But I was told in #msys2 on OFTC:

10:12:16 dwfreed copypaste: fix the python library, no packaging of zlib ships libzlib, it's all libz

So, -lzlib should become -lz

[scoder (scoder)]

Thanks for the report. pip should normally download a wheel, and even for a local build, it should download the depdendencies automatically and not use locally installed libs.

Could you provide the complete command that you used for installing, the pip build log, and anything else that may help understand what's different in your system?

[Willard Dawson (willard-dawson)]

This error is also affecting me as I attempt to install https://github.com/zblurx/dploot using MSYS2 / MINGW64.

[scoder (scoder)]

Does a static build work for you?

STATIC_DEPS=true pip install lxml