为了让Aptana支持GitHub，需要安装Egit，但在的时候碰到两个错误,一个是关于缺少EGit Mylyn另一个是缺少org.eclipse.egit.import.feature.group。

缺少Egit Mylyn的提示：

Cannot complete the install because one or more required items could not be found.
  Software being installed: EGit Mylyn 1.1.0.201109151100-r (org.eclipse.egit.mylyn.feature.group 1.1.0.201109151100-r)
  Missing requirement: EGit Mylyn 1.1.0.201109151100-r (org.eclipse.egit.mylyn.feature.group 1.1.0.201109151100-r) requires 'org.eclipse.mylyn.team_feature.feature.group 3.5.0' but it could not be found.

缺少org.eclipse.egit.import.feature.group的提示：

Cannot complete the install because one or more required items could not be found. 
Software being installed: 
	EGit Import Support 2.0.0.201206130900-r (org.eclipse.egit.import.feature.group 2.0.0.201206130900-r) Missing requirement: 
	EGit Import Support 2.0.0.201206130900-r (org.eclipse.egit.import.feature.group 2.0.0.201206130900-r) requires
	'org.eclipse.team.core 3.6.100' but it could not be found

Cannot complete the install because one or more required items could not be found.
Software being installed: Eclipse Git Team Provider 3.0.1.201307141637-r (org.eclipse.egit.feature.group 3.0.1.201307141637-r)
Missing requirement: Git Team Provider UI 3.0.1.201307141637-r (org.eclipse.egit.ui 3.0.1.201307141637-r) requires 'bundle org.eclipse.team.core [3.6.100,4.0.0)' but it could not be found
Cannot satisfy dependency:
From: Eclipse Git Team Provider 3.0.1.201307141637-r (org.eclipse.egit.feature.group 3.0.1.201307141637-r)
To: org.eclipse.egit.ui [3.0.1.201307141637-r]

解决这两个问题，很简单：
只要取消EGit Mylyn和EGit Import Support这两个功能能就可以了。因为这两个功能都是可选的。不会影响使用GitHub。