Unable to instal zlib package

Wile · April 30, 2025, 12:41pm

Hello,
I set up a MSVC toolchain on a windows 11 system, it’s all running well with 4.14 and after the installation of some packages I ran into problem with the zlib package. It needs a rebuild and my actual c compiler is the Microsoft CL and it can’t handle the WExtra option. Any solution.?

PS: I’ve used “opam install zlib”

nojb · April 30, 2025, 12:48pm

Looking at the source, we see

github.com/madroach/ocaml-zlib

src/dune

d34ab77ad


      
          (library
           (name zlib)
           (public_name zlib)
           (synopsis "wrapper for the zlib compression library")
           (flags :standard -safe-string)
           (libraries bigarray)
           (c_flags :standard -Wall -Wextra -Wno-unused-parameter -pedantic -std=c11)
           (c_names zlib_stubs)
           (c_library_flags -lz)
          )

This is a typical example of a project that is incompatible with MSVC as written because it uses GCC-specific flags in its build system. So there is no easy solution to your problem, other than fixing the package build instructions (and ideally upstreaming the changes).

Cheers,
Nicolas

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Unable to instal zlib package

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