Topic says everything.
Created attachment 101198 [details, diff] patch for qt-4.2.1 say error if use icc and have pch flag
Eh... ICC is not a supported compiler; so IMO either patch it properly or don't bloat ebuild with junk, it will die anyway. (Plus use common sense when setting your use flags: Enable precompiled header support (gcc >3.4, faster compilation times) uh that doesn't exactly sound like it would work w/ ICC, does it?!)
I updated the description of the flag in use.local.desc to better clarify that it's for gcc >3.4 only.