Cannot use QTQuick 2 with ANGLE on Win7 with minGW 32 bit build

Moving from Qt 5.0.2 to 5.1, I lost the ability to run QTQuick 2.0 code.

I got the following messages:

getProcAddress: Unable to resolve 'glCreateProgram'
getProcAddress: Unable to resolve 'glCreateProgramARB'
getProcAddress: Unable to resolve 'glCreateProgramObject'
getProcAddress: Unable to resolve 'glCreateProgramObjectARB'
QOpenGLShaderProgram: could not create shader program
getProcAddress: Unable to resolve 'glCreateShader'
getProcAddress: Unable to resolve 'glCreateShaderARB'
getProcAddress: Unable to resolve 'glCreateShaderObject'
getProcAddress: Unable to resolve 'glCreateShaderObjectARB'
QOpenGLShader: could not create shader
List of attribute names is either too long or not null-terminated.
Maximum number of attributes on this hardware is 0.
Vertex shader:
attribute highp vec4 vertexCoord;
attribute highp vec4 vertexColor;
uniform highp mat4 matrix;
uniform highp float opacity;
varying lowp vec4 color;
void main()

{ gl_Position = matrix * vertexCoord; color = vertexColor * opacity; }

Fragment shader:
varying lowp vec4 color;
void main()

{ gl_FragColor = color; }

I do not know if it is intended, that the minGW build needs openGL by default.

Thank you