CMake refuse to work if sh.exe is here?

appveyor.yml

@@ -1,14 +1,24 @@
 environment:
   JAVA_HOME: C:\Program Files\Java\jdk1.8.0
-  CXX: C:\MinGW\bin\g++.exe
-  CC: C:\MinGW\bin\gcc.exe
-  CMAKE_CXX_COMPILER: C:\MinGW\bin\g++.exe
-  CMAKE_CC_COMPILER: C:\MinGW\bin\gcc.exe
+  CXX: C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin\g++.exe
+  CC:  C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin\gcc.exe
+  CMAKE_CXX_COMPILER: C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin\g++.exe
+  CMAKE_CC_COMPILER:  C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin\gcc.exe
+#
+
+install:
+  # CMake refuses to generate MinGW Makefiles if sh.exe is in the Path
+  - ps: Get-Command sh.exe -All | Remove-Item
+#
 
 build_script:
   - echo %CMAKE_CC_COMPILER%
   - echo %CMAKE_CXX_COMPILER%
   - cmake -DCMAKE_BUILD_TYPE= -G "CodeBlocks - MinGW Makefiles" jni
   - cmake --build . --target all -- -j 8
-  - gradlew check
+  - gradlew check --info
+#
 
+before_build:
+  - set Path=C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin;%Path%
+#