Conflicts on Install GWT on Ganymede (3.5.1)

Cannot complete the install because of a conflicting dependency.
Software being installed: Google App Engine Java SDK 1.2.6
1.2.6.v200910131704
(com.google.appengine.eclipse.sdkbundle.e35.feature.feature.group
1.2.6.v200910131704)
Only one of the following can be installed at once:
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)
Cannot satisfy dependency:
From: Google App Engine Java SDK 1.2.6 1.2.6.v200910131704
(com.google.appengine.eclipse.sdkbundle.e35.feature.feature.group
1.2.6.v200910131704)
To: com.google.gdt.eclipse.suite.e35.feature.feature.group 1.1.2
Cannot satisfy dependency:
From: Google Plugin for Eclipse 3.5 1.1.2.v200910131704
(com.google.gdt.eclipse.suite.e35.feature.feature.group
1.1.2.v200910131704)
To: org.eclipse.platform.feature.group [3.5.0,3.6.0)
Cannot satisfy dependency:
From: Google Plugin for Eclipse 3.5 1.1.2.v200910131704
(com.google.gdt.eclipse.suite.e35.feature.feature.group
1.1.2.v200910131704)
To: org.eclipse.wst.sse.ui 0.0.0
Cannot satisfy dependency:
From: Eclipse Platform
3.5.1.R35x_v20090910-9lEeG9OFtY8dO6SPxmI7z0ZuZBD-lz08RfIkCCB
(org.eclipse.platform.feature.group
3.5.1.R35x_v20090910-9lEeG9OFtY8dO6SPxmI7z0ZuZBD-lz08RfIkCCB)
To: org.eclipse.rcp.feature.group
[3.5.1.R35x_v20090811-9gAPFx_FqYHBE_BVbc7z-pM6e7BA]
Cannot satisfy dependency:
From: Eclipse RCP 3.5.1.R35x_v20090811-9gAPFx_FqYHBE_BVbc7z-
pM6e7BA (org.eclipse.rcp.feature.group
3.5.1.R35x_v20090811-9gAPFx_FqYHBE_BVbc7z-pM6e7BA)
To: com.ibm.icu [4.0.1.v20090822]
Cannot satisfy dependency:
From: Structured Source Editor 1.1.4.v200901202345
(org.eclipse.wst.sse.ui 1.1.4.v200901202345)
To: bundle com.ibm.icu [3.8.1,4.0.0)

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