Installing Mylyn from extras fails due the following dependency:

Extras - http://www.qa.jboss.com/binaries/RHDS/updates/development/6.0.0.Alpha1b.extras/

Cannot complete the install because of a conflicting dependency.
Software being installed: Mylyn (Selected) 6.0.0.Alpha1-v20120911-2223-H25 (com.jboss.jbds.mylyn.feature.feature.group 6.0.0.Alpha1-v20120911-2223-H25)
Software currently installed: JBoss Developer Studio (Branded Product) 6.0.0.Alpha1-v20120911-2223-H25 (com.jboss.jbds.all 6.0.0.Alpha1-v20120911-2223-H25)
Only one of the following can be installed at once:
Mylyn Commons UI 3.6.1.v20110720-0100 (org.eclipse.mylyn.commons.ui 3.6.1.v20110720-0100)
Mylyn Commons UI 3.8.0.v20120612-0600 (org.eclipse.mylyn.commons.ui 3.8.0.v20120612-0600)
Cannot satisfy dependency:
From: Atlassian Connector for Eclipse FishEye UI 3.0.2.v20111010 (com.atlassian.connector.eclipse.fisheye.ui 3.0.2.v20111010)
To: package org.eclipse.mylyn.internal.provisional.commons.ui 0.0.0
Cannot satisfy dependency:
From: JBoss Developer Studio (Branded Product) 6.0.0.Alpha1-v20120911-2223-H25 (com.jboss.jbds.all 6.0.0.Alpha1-v20120911-2223-H25)
To: com.jboss.jbds.product.feature.feature.group [6.0.0.Alpha1-v20120911-2223-H25]
Cannot satisfy dependency:
From: Mylyn (Selected) 6.0.0.Alpha1-v20120911-2223-H25 (com.jboss.jbds.mylyn.feature.feature.group 6.0.0.Alpha1-v20120911-2223-H25)
To: com.atlassian.connector.eclipse.fisheye.ui 0.0.0
Cannot satisfy dependency:
From: JBoss Developer Studio (Core Features) 6.0.0.Alpha1-v20120911-2223-H25 (com.jboss.jbds.product.feature.feature.group 6.0.0.Alpha1-v20120911-2223-H25)
To: org.jboss.tools.central.feature.feature.group [1.1.0.Alpha1-v20120910-1152-H39]
Cannot satisfy dependency:
From: Mylyn Commons UI 3.8.0.v20120612-0600 (org.eclipse.mylyn.commons.workbench 3.8.0.v20120612-0600)
To: bundle org.eclipse.mylyn.commons.ui 3.8.0
Cannot satisfy dependency:
From: JBoss Central 1.1.0.Alpha1-v20120910-1152-H39 (org.jboss.tools.central 1.1.0.Alpha1-v20120910-1152-H39)
To: bundle org.eclipse.mylyn.commons.workbench 3.8.0
Cannot satisfy dependency:
From: JBoss Central 1.1.0.Alpha1-v20120910-1152-H39 (org.jboss.tools.central.feature.feature.group 1.1.0.Alpha1-v20120910-1152-H39)
To: org.jboss.tools.central [1.1.0.Alpha1-v20120910-1152-H39]