[boost] build from cvs, what is ICU_PATH?

From: Neal Becker (ndbecker2_at_[hidden])
Date: 2005-05-27 09:10:57

I'm trying to build from cvs on Linux.  Here's what I get:

PYTHON_ROOT=/usr PYTHON_VERSION=2.4 bjam -sTOOLS=gcc stage
******************************************************

Building Boost.Regex with Unicode/ICU support disabled.
HINT: define the environment variable ICU_PATH to point to the
root directy of your ICU installation if you have one.
Couldn't find utypes.h in 
******************************************************

locate utypes.h
/usr/include/schily/utypes.h

Is this what it wants?  How to I use it?