Steven G. Johnson

@crstnbr, `USE_BLAS64=0` means that it assumes that the BLAS (matrix-multiplication etc.) library is compiled to use 32-bit integers for its interfaces. This means that you can't do linear-algebra operations on...

Which Python is PyCall configured to use? i.e. what is `PyCall.python`?

You need to set `ENV["PYTHON"]` to an absolute path. Using `".env\\Scripts\\python.exe"` will not work.

`DEPOT_PATH` is not an environment variable, it is just an ordinary Julia variable.

Note that the default Conda rootenv is not stored in the package directory, it is stored in `~/.julia/conda/deps.jl` (so that it persists across upgrades). To remove it and reinstall Conda...

Is @PaoloPonce is willing to continue debugging his Conda-based configuration? Otherwise we may have to close as nonreproducible.

Did you remove `"C:\Users\necka\.julia\conda\deps.jl"`? That's where the ROOTENV setting is saved between builds. Is the `CONDA_JL_HOME` environment variable unset?

Since we don't know what your actual problem was, and it is no longer reproducible, I'm closing this. We can reopen if someone reproduces the same problem.

Re-opening this issue, since it still seems to be happening to JuliaPro users. cc @aviks @StefanKarpinski @bmharsha Meanwhile, a workaround is: ```jl import Pkg rm(joinpath(homedir(), ".julia", "conda"), recursive=true) Pkg.build("PyCall") ```

@ViralBShah, does JuliaPro on Windows come prepackaged with a `.julia\conda\deps.jl` file that has an invalid ROOTENV path or something?