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OpenGL CG with GLSL profile and "gl_" variables not accessibles

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Hi,

I'm trying to use CG with OpenGL trough the CG profiles glslv and glslf. But I'm getting the error C5059 "gl_" variables are not accessible, every time I try to use a built-in glsl variable (like gl_ModelViewProjectionMatrix).
However the profile documentation says that all the uniform constants and variables listed in the glsl v1.20 doc are available. I tried to set the version=120 in the profile options but it doesn't change anything.
Any idea on what I should do to be able to use built-in gl_ variables in my cg shaders ?

Thanks!

ps : my very simple failing vertex shader
void main(
float4 position : POSITION,
out float4 oPosition : POSITION
)
{
oPosition = mul(gl_ModelViewProjectionMatrix, position);
}

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