-#- ps: |
-# if ($env:Compiler -eq "mingw" -AND -Not (Test-Path "C:\mingw64")) {
-# # Install MinGW64
-# $file = "x86_64-4.9.2-release-win32-seh-rt_v4-rev3.7z"
-# $url = "https://bintray.com/artifact/download/drewwells/generic/"
-# $url += $file
-# Invoke-WebRequest -UserAgent wget -Uri $url -OutFile $file
-# &7z x -oC:\ $file > $null
-# }
-- set PATH=C:\mingw64\bin;%PATH%
-- set CC=gcc
+- if [%COMPILER%]==[MinGW] set PATH=C:\MinGW\bin;%PATH%
+- if [%COMPILER%]==[MinGW] mingw-get update
+- if [%COMPILER%]==[MinGW] rename "C:\Program Files (x86)\Git\bin\sh.exe" "sh2.exe"
+- if [%COMPILER%]==[MinGW-w64] set PATH=C:\mingw64\bin;%PATH%
+- if [%COMPILER%]==[MinGW-w64] rename "C:\Program Files (x86)\Git\bin\sh.exe" "sh2.exe"
+- if [%COMPILER%]==[MinGW-w64] appveyor DownloadFile "https://raw.githubusercontent.com/symengine/dependencies/5cff7d1736877336cf9fb58267111beea4fa152f/x86_64-4.9.1-release-posix-seh-rt_v3-rev1.7z" -FileName mw64.7z
+- if [%COMPILER%]==[MinGW-w64] 7z x -oC:\ mw64.7z > NUL
+- if [%COMPILER%]==[MSYS2] set PATH=C:\msys64\bin,%PATH%