Cannot complete the install because of a conflicting dependency.
  Software being installed: PHP Development Tools (PDT) SDK Feature 2.1.1.v20090707-1108-51584QACJCRCUeNRkNYbOJecWK9O (org.eclipse.php.sdk.feature.group 2.1.1.v20090707-1108-51584QACJCRCUeNRkNYbOJecWK9O)
  Software currently installed: Eclipse Platform 3.7.0.I20120502-2000 (org.eclipse.platform.ide 3.7.0.I20120502-2000)
  Only one of the following can be installed at once: 
    International Components for Unicode for Java (ICU4J) 4.4.2.v20110823 (com.ibm.icu 4.4.2.v20110823)
    International Components for Unicode for Java (ICU4J) 4.0.1.v20090822 (com.ibm.icu 4.0.1.v20090822)
    International Components for Unicode for Java (ICU4J) 4.0.1.v20090415 (com.ibm.icu 4.0.1.v20090415)
  Cannot satisfy dependency:
    From: Java EMF Model Utilities 2.0.200.v200905140200 (org.eclipse.jem.util 2.0.200.v200905140200)
    To: bundle com.ibm.icu [3.8.1.1,4.1.0)
  Cannot satisfy dependency:
    From: Java EMF Model Utilities 2.0.201.v201001252130 (org.eclipse.jem.util 2.0.201.v201001252130)
    To: bundle com.ibm.icu [3.8.1.1,4.1.0)
  Cannot satisfy dependency:
    From: PHP Development Tools (PDT) Runtime Feature 2.1.3.v20090914-1400-7L7979F8NcJKhKWS09TTK2 (org.eclipse.php.feature.group 2.1.3.v20090914-1400-7L7979F8NcJKhKWS09TTK2)
    To: org.eclipse.php.ui [2.1.1.v20090921-1100]
  Cannot satisfy dependency:
    From: PHP Development Tools (PDT) SDK Feature 2.1.1.v20090707-1108-51584QACJCRCUeNRkNYbOJecWK9O (org.eclipse.php.sdk.feature.group 2.1.1.v20090707-1108-51584QACJCRCUeNRkNYbOJecWK9O)
    To: org.eclipse.php.feature.group [2.1.3.v20090914-1400-7L7979F8NcJKhKWS09TTK2]
  Cannot satisfy dependency:
    From: PDT UI Plug-in 2.1.1.v20090921-1100 (org.eclipse.php.ui 2.1.1.v20090921-1100)
    To: bundle org.eclipse.wst.common.frameworks.ui 0.0.0
  Cannot satisfy dependency:
    From: Eclipse Platform 3.8.0.dist-A2F8PIS8G0V65omegoFRjDu2ALt-R2_gtSeiRH (org.eclipse.platform.feature.group 3.8.0.dist-A2F8PIS8G0V65omegoFRjDu2ALt-R2_gtSeiRH)
    To: org.eclipse.rcp.feature.group [3.8.0.dist-8LA2GO8FTJUDJ21934]
  Cannot satisfy dependency:
    From: Eclipse Platform 3.7.0.I20120502-2000 (org.eclipse.platform.ide 3.7.0.I20120502-2000)
    To: org.eclipse.platform.feature.group [3.8.0.dist-A2F8PIS8G0V65omegoFRjDu2ALt-R2_gtSeiRH]
  Cannot satisfy dependency:
    From: Eclipse RCP 3.8.0.dist-8LA2GO8FTJUDJ21934 (org.eclipse.rcp.feature.group 3.8.0.dist-8LA2GO8FTJUDJ21934)
    To: com.ibm.icu [4.4.2.v20110823]
  Cannot satisfy dependency:
    From: Common Frameworks 1.1.300.v200904160730 (org.eclipse.wst.common.frameworks 1.1.300.v200904160730)
    To: bundle org.eclipse.jem.util [2.0.100,3.0.0)
  Cannot satisfy dependency:
    From: WTP UI Plug-in 1.1.301.v200908101600 (org.eclipse.wst.common.frameworks.ui 1.1.301.v200908101600)
    To: bundle org.eclipse.wst.common.frameworks [1.1.200,2.0.0)