unmet availability conditions: os != "win32"

[aimanimtiaz]

I am a Windows user and I have been trying to install core on my computer through Cygwin, but I have been getting the following error:

The following dependencies couldn't be met:

• core -> jst-config
  unmet availability conditions: os != "win32"

No solution found, exiting

One possible solution to 'make' a repository which had ppx_inline_test in the configuration file was to install ppx_jane (and some other dependencies like core_kernel) separately. But now I have a repository that I need to install, but this repository needs the core library (among others) preinstalled which obviously I do not have on my computer. Is there any way to make core work on my computer?

Where is the os != "win32" condition? I can't see it when looking at the opam files for core and jst-config

[talyian]

For anyone else getting this issue, compatibility notes are set on the packages in https://github.com/fdopen/opam-repository-mingw when you're using the fdopen opam build and you're trying to install something that won't build on windows.