Cannot complete the install because of a conflicting dependency.
  Software being installed: PDT Feature 1.0.5.v20081126-1856 (org.eclipse.php_feature.feature.group 1.0.5.v20081126-1856)
  Software currently installed: Eclipse Platform 3.7.0.I20110613-1736 (org.eclipse.platform.ide 3.7.0.I20110613-1736)
  Only one of the following can be installed at once: 
    International Components for Unicode for Java (ICU4J) 4.4.2.v20110208 (com.ibm.icu 4.4.2.v20110208)
    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) 3.8.1.v20080530 (com.ibm.icu 3.8.1.v20080530)
    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: PDT Feature 1.0.5.v20081126-1856 (org.eclipse.php_feature.feature.group 1.0.5.v20081126-1856)
    To: org.eclipse.wst.feature.group [3.0.0,4.0.0)
  Cannot satisfy dependency:
    From: Eclipse Platform 3.7.2.dist-9nF7UHagFqn9pElwWhC90gLz-soEuSGYmtSeiRH (org.eclipse.platform.feature.group 3.7.2.dist-9nF7UHagFqn9pElwWhC90gLz-soEuSGYmtSeiRH)
    To: org.eclipse.rcp.feature.group [3.7.2.dist-8R9GFpOFUdy-521934]
  Cannot satisfy dependency:
    From: Eclipse Platform 3.7.0.I20110613-1736 (org.eclipse.platform.ide 3.7.0.I20110613-1736)
    To: org.eclipse.platform.feature.group [3.7.2.dist-9nF7UHagFqn9pElwWhC90gLz-soEuSGYmtSeiRH]
  Cannot satisfy dependency:
    From: Eclipse RCP 3.7.2.dist-8R9GFpOFUdy-521934 (org.eclipse.rcp.feature.group 3.7.2.dist-8R9GFpOFUdy-521934)
    To: com.ibm.icu [4.4.2.v20110823]
  Cannot satisfy dependency:
    From: Web Developer Tools 3.0.4.v200811190840-7A-8l8Qqcz0HyVgjXUE-iuOYZ9ai (org.eclipse.wst.feature.group 3.0.4.v200811190840-7A-8l8Qqcz0HyVgjXUE-iuOYZ9ai)
    To: org.eclipse.wst.jsdt.feature.feature.group [1.0.4.v200812112112-6-E75BcMAAyDJGhFpNN]
  Cannot satisfy dependency:
    From: JavaScript Development Tools Core 1.0.104.v200901281939 (org.eclipse.wst.jsdt.core 1.0.104.v200901281939)
    To: bundle com.ibm.icu [3.8.1,4.0.0)
  Cannot satisfy dependency:
    From: JavaScript Developer Tools 1.0.4.v200812112112-6-E75BcMAAyDJGhFpNN (org.eclipse.wst.jsdt.feature.feature.group 1.0.4.v200812112112-6-E75BcMAAyDJGhFpNN)
    To: org.eclipse.wst.jsdt.core [1.0.104.v200901281939]