message: ls mingw on appveyor
diff: @@ -42,8 +42,10 @@ install:
  # Upgrade to the latest version of pip to avoid it displaying warnings
  # about it being out of date.
  - "pip install --disable-pip-version-check --user --upgrade pip"
  -
  + # - copy c:\MinGW\bin\mingw32-make.exe c:\MinGW\bin\make.exe
  - ps: "ls ."
  + - ps: "ls c:\MinGW"
  + - ps: "ls c:\MinGW\\bin\\"
  # Install the build dependencies of the project. If some dependencies contain
  # compiled extensions and are not provided as pre-built wheel packages,
  