Hello everybody,
this man3 page ( http://www.opengl.org/sdk/docs/man3/xhtml/glFramebufferTextureFace.xml ) talks about the function mentioned in the topic, glFramebufferTextureFace, but I found it neither in the spec nor in gl3.h. Does this function even exist? Isn’t glFramebufferTexture2D meant to be used with cube map faces? If not, would somebody please be so kind to remove it from the man pages? Thanks 
On another note, the certificate used for https ( https://www.opengl.org/sdk/docs/man3/xhtml/glFramebufferTextureFace.xml ) seems to be outdated since almost a year.
You should submit a bug to the Khronos Bugzilla about this. glFramebufferTextureFace doesn’t exist.
glFramebufferTextureFace is a function extension of ARB_geometry_shader4.
cf: http://www.opengl.org/registry/specs/ARB/geometry_shader4.txt