Qt5, cmake and MinGW

Qt5, cmake and MinGW

I am trying to built a "Hello World" project with Qt 5 and cmake under MinGW.
This is the CMakeLists.txt file (taken from the on-line doc):
project(Qt5_cmake_test)
cmake_minimum_required(VERSION 2.8.11)
set(CMAKE_PREFIX_PATH "C:/Qt/Qt5.1.1/5.1.1/mingw48_32")
# Find includes in corresponding build directories
set(CMAKE_INCLUDE_CURRENT_DIR ON)
# Instruct CMake to run moc automatically when needed.
set(CMAKE_AUTOMOC ON)
# Find the QtWidgets library
find_package(Qt5Widgets)
# Add the source files from the current directory
aux_source_directory(. SRC_LIST)
# Tell CMake to create the executable
add_executable(${PROJECT_NAME} WIN32 ${SRC_LIST})
# Use the Widgets module from Qt5
target_link_libraries(${PROJECT_NAME} Qt5::Widgets)
The source code is the one generated automatically when creating a new
project (which produces an empty window).
Configuring from the Windows command prompt with: cmake -G "MinGW
Makefiles" ..\Qt5_cmake_test
I get these errors:
CMake Error at C:/Program Files (x86)/CMake
2.8/share/cmake-2.8/Modules/CMakeMinGWFindMake.cmake:20 (message):
sh.exe was found in your PATH, here:
C:/Program Files (x86)/Git/bin/sh.exe
For MinGW make to work correctly sh.exe must NOT be in your path.
Run cmake from a shell that does not have sh.exe in your PATH.
If you want to use a UNIX shell, then use MSYS Makefiles.
Call Stack (most recent call first):
CMakeLists.txt:8 (project)
CMake Error: Error required internal CMake variable not set, cmake may be
not be built correctly.
Missing variable is:
CMAKE_C_COMPILER_ENV_VAR
CMake Error: Error required internal CMake variable not set, cmake may be
not be built correctly.
Missing variable is:
CMAKE_C_COMPILER
CMake Error: Could not find cmake module
file:C:/Users/pietro.mele/projects/tests/buildSystem_test/Qt5_cmake_test-build/CMakeFiles/2.8.11.2/CMakeCCompiler.cmake
CMake Error: Error required internal CMake variable not set, cmake may be
not be built correctly.
Missing variable is:
CMAKE_CXX_COMPILER_ENV_VAR
CMake Error: Error required internal CMake variable not set, cmake may be
not be built correctly.
Missing variable is:
CMAKE_CXX_COMPILER
CMake Error: Could not find cmake module
file:C:/Users/pietro.mele/projects/tests/buildSystem_test/Qt5_cmake_test-build/CMakeFiles/2.8.11.2/CMakeCXXCompiler.cma
ke
CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
-- Configuring incomplete, errors occurred!
So it seems it is not able to find the compiler. Is there a way to let
cmake find it on its own, or just giving it the CMAKE_PREFIX_PATH
directory?
Do I have to manually specify all those variables in the makefile or as
environment variables in Windows?
I tried both from the standard Windows command prompt and from the one
provided by Qt, with the same result. Is it OK to build from the Windows
command prompt, or should I do it from the MinGW's shell?
Platform:
Qt 5.1
CMake 2.8.11.2
MinGW/GCC 4.8
Windows 7