to replace com.ibm.icu:

1. download com.ibm.icu.base package
2. extract plugins to some place
3. change com.ibm.icu.base to com.ibm.icu in Manifest.MF files and directory names
4. pack directories back to jars
5. remove old com.ibm.icu plugins from eclipse plugin folder
6. copy new jar to eclipse plugin folder
7. done

note:

archived jars of com.ibm.icu.base modules should have names like:
com.ibm.icu.source_4.2.1.v20100412.jar
com.ibm.icu_4.2.1.v20100412.jar
