document icu4 for FreeBSD

diff --git a/buildconf.sh b/buildconf.sh
index 7113189..c82194a 100755 (executable)
--- a/buildconf.sh
+++ b/buildconf.sh
@@ -131,6 +131,7 @@ EOF
 When building from a Git, you need these FreeBSD Ports:
   pkg_add -r autoconf262 automake110 libtool bison tcl84 \\
              docbook-xsl libxml2 libxslt
+  pkg_add -r icu4
 EOF
     fi
 fi