I am trying to install the CDT plugin on top my existing version of Eclipse, which was for Java. The problem is that I got this error message when I tried doing so via "Install New Software...":

Cannot complete the install because of a conflicting dependency.
  Software being installed: Eclipse C/C++ Development Tools 4.0.3.200802251018 (org.eclipse.cdt.feature.group 4.0.3.200802251018)
  Software currently installed: Eclipse IDE for Java Developers 1.3.1.20100916-1202 (epp.package.java 1.3.1.20100916-1202)
  Only one of the following can be installed at once: 
    International Components for Unicode for Java (ICU4J) 4.2.1.v20100412 (com.ibm.icu 4.2.1.v20100412)
    com.ibm.icu 3.6.1.v20070906
  Cannot satisfy dependency:
    From: Eclipse IDE for Java Developers 1.3.1.20100916-1202 (epp.package.java 1.3.1.20100916-1202)
    To: org.eclipse.epp.package.java.feature.feature.group [1.3.1.20100916-1202]
  Cannot satisfy dependency:
    From: Eclipse C/C++ Development Tools 4.0.3.200802251018 (org.eclipse.cdt.feature.group 4.0.3.200802251018)
    To: com.ibm.icu [3.4.0,4.0.0)
  Cannot satisfy dependency:
    From: EPP Java Package 1.3.1.20100916-1202 (org.eclipse.epp.package.java.feature.feature.group 1.3.1.20100916-1202)
    To: org.eclipse.rcp.feature.group 3.6.0
  Cannot satisfy dependency:
    From: Eclipse RCP 3.6.0.v20100519-9OArFKvFtsd7WLUKh-DcYTS (org.eclipse.rcp.feature.group 3.6.0.v20100519-9OArFKvFtsd7WLUKh-DcYTS)
    To: com.ibm.icu [4.2.1.v20100412]
  Cannot satisfy dependency:
    From: Eclipse RCP 3.6.1.r361_v20100827-9OArFLdFjY-ThSQXmKvKz0_T (org.eclipse.rcp.feature.group 3.6.1.r361_v20100827-9OArFLdFjY-ThSQXmKvKz0_T)
    To: com.ibm.icu [4.2.1.v20100412]

What can I do to solve this?