-1. Download and build ICU4C. For more instructions on downloading and building
- ICU4C, see the ICU4C readme at:
- http://source.icu-project.org/repos/icu/trunk/icu4c/readme.html#HowToBuild
+1. *Linux*
+ Download, configure, and build ICU4C. When you configure ICU4C, you must
+ set the environment variable ICU_DATA_BUILDTOOL_OPTS to
+ "--include_uni_core_data" to build additional required ICU4J data:
+
+ ICU_DATA_BUILDTOOL_OPTS=--include_uni_core_data ./runConfigureICU Linux
+
+ *Windows*
+ - Add ICU_DATA_BUILDTOOL_OPTS as a system environment variable with value "--include_uni_core_data"
+ - Build $icu4c_root\source\allinone\allinone.sln in Visual Studio
+
+ For more instructions on downloading and building ICU4C,
+ see the ICU4C readme at:
+ https://htmlpreview.github.io/?https://github.com/unicode-org/icu/blob/master/icu4c/readme.html#HowToBuild