Hi,
In Julia 1.1.0, Windows, I try to build PyCall (with a view to PyPlot).
Julia> Pkg.build(“PyCall”)
Building Conda ─→C:\Users\philippem\.julia\packages\Conda\CpuvI\deps\build.log
Building PyCall →C:\Users\philippem\.julia\packages\PyCall\ttONZ\deps\build.log
┌ Error: Error buildingPyCall:
│ Collecting package metadata: …working… done
│ Solving environment: …working… done
│
│ ## Package Plan ##
│
│ environment location: C:\Users\philippem.julia\conda\3
│
│ added / updated specs:
│ - numpy
│
│
│ The following NEW packages will be INSTALLED:
│
│ blas pkgs/main/win-64::blas-1.0-mkl
│ icc_rt pkgs/main/win-64::icc_rt-2019.0.0-h0cc432a_1
│ intel-openmp pkgs/main/win-64::intel-openmp-2019.3-203
│ mkl pkgs/main/win-64::mkl-2019.3-203
│ mkl_fft pkgs/main/win-64::mkl_fft-1.0.12-py36h14836fe_0
│ mkl_random pkgs/main/win-64::mkl_random-1.0.2-py36h343c172_0
│ numpy pkgs/main/win-64::numpy-1.16.3-py36h19fb1c0_0
│ numpy-base pkgs/main/win-64::numpy-base-1.16.3-py36hc3f5095_0
│
│
│ Preparing transaction: …working… done
│ Verifying transaction: …working… failed
│
│ NoSpaceLeftError: No space left on devices.
└ @ Pkg.Operations C:\cygwin\home\Administrator\buildbot\worker\package_win64\build\usr\share\julia
stdlib\v1.1\Pkg\src\Operations.jl:1075
… and I have no idea what is going on! 
No space left on devices? What devices?
Thank you if you can help!
Philippe
