ICU-49.1 has many changes, so we need to verify that its users still build and work:

Usedby		tested		Status

beecrypt
boost		2012-04-08	ok
c3270
calibre
couchdb
eflwebkit
firebird
firebird25	2012-04-01	ok
gdisk
harfbuzz
libxml2		2012-04-01	ok
libxslt		2012-04-02	ok
mono
neon		2012-04-09	ok
openoffice
parrot		2012-04-02	ok
php
php-dev
qt4		2012-04-08	ok
qtbase		2012-04-04	ok
raptor		2012-04-01	ok
subversion	2012-04-09	ok
sword
webkitgtk
webkitgtk3
x3270
xalan-c
xerces-c

.