This document describes how libicui18n was packaged for build2. In particular,
this understanding will be useful when upgrading to a new upstream version.
See ../README-DEV for general notes on ICU packaging.

Symlink the required upstream directories into libicui18n/:

$ ln -s ../../upstream/icu4c/source/i18n libicui18n

Fix Clang 10 compilation errors:

$ cp libicui18n/i18n/stsearch.cpp libicui18n
$ patch -p0 <libicui18n/stsearch.cpp.patch

$ cp libicui18n/i18n/olsontz.cpp libicui18n
$ patch -p0 <libicui18n/olsontz.cpp.patch

$ cp libicui18n/i18n/vtzone.cpp libicui18n
$ patch -p0 <libicui18n/vtzone.cpp.patch

$ cp libicui18n/i18n/rbtz.cpp libicui18n
$ patch -p0 <libicui18n/rbtz.cpp.patch

$ cp libicui18n/i18n/dtitvfmt.cpp libicui18n
$ patch -p0 <libicui18n/dtitvfmt.cpp.patch

$ cp libicui18n/i18n/basictz.cpp libicui18n
$ patch -p0 <libicui18n/basictz.cpp.patch