--- boost-1.46.1.ebuild.old	2011-08-25 18:54:10.000000000 +0200
+++ boost-1.46.1.ebuild	2011-08-25 19:15:55.000000000 +0200
@@ -156,6 +156,7 @@
 	# for more infomration.
 
 	use icu && OPTIONS="-sICU_PATH=/usr"
+	use icu || OPTIONS="--disable-icu"
 	use mpi || OPTIONS="${OPTIONS} --without-mpi"
 	use python || OPTIONS="${OPTIONS} --without-python"