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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