This is a simple program demonstrating how to build and statically link ICU.
To build, simply run make. This should work on macOS and Linux. There is also a Dockerfile provided, if you want to do the build in a Linux container.
The resulting demo program produces the following output:
Original: Das Kind überquerte die Straße.
Uppercase: DAS KIND ÜBERQUERTE DIE STRASSE.
This demo is released into the public domain. ICU is distributed by the Unicode Consortium under its own license.