Rotate a texture ?

How can we rotate a texture 2D ? I rotate a GL_QUADS but the texture don't follow... Is there a function for the texture ?

[FoxDie]

You must transform texture coordinates.

[zed]

have u disabled texgen?
are u specifying texture coordinates for each vertice eg glTexCoord2f(0,0)

Yes, I use the glTexCoord2f but the QUAD have a rotate of 45° (I don't use GenTex) and the texture is at 0°... Is there a solution ?