How to check or set GLSL version?

[bartosz.kwasniewski]

You can check and set in QGLFormat a version of OpenGL, but how to do the same for GLSL?
There is glGetString, but for GL_SHADING_LANGUAGE_VERSION you get undeclared identifier

const GLubyte* pVersion = glGetString(GL_VERSION); 
//const GLubyte* pShaderVersion = glGetString(GL_SHADING_LANGUAGE_VERSION); //undeclared identifier

const GLubyte* pVersion = glGetString(GL_VERSION); 
//const GLubyte* pShaderVersion = glGetString(GL_SHADING_LANGUAGE_VERSION); //undeclared identifier

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[stampede]

#include "glext.h"

#include "glext.h"

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glext.h

[bartosz.kwasniewski]

Thank you. I tried to include it, but I had errors, but now i put it after<QtOpenGL>, and it's working.

#include <QtGui>
#include <QtOpenGL>
#include <GL\glext.h> //Must be placed after "#include <QtOpenGL>"
#include "MyQGLWidget.h"
#include <QDebug>
...

#include <QtGui>
#include <QtOpenGL>
#include <GL\glext.h> //Must be placed after "#include <QtOpenGL>"
#include "MyQGLWidget.h"
#include <QDebug>
...

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And I have: GL_VERSION: 3.3.0 GL_SHADING_LANGUAGE_VERSION: 3.30 NVIDIA via Cg compiler