my eclipse has been configured for Java and pydev, now i want to configure C/C++ development tools with Eclipse. i dont want to download the whole Eclipse IDE for C/C++ Developers, for it is not convenient. so i decided to install CDT in my Eclipse.

Help ==> Install New Software, then input http://download.eclipse.org/tools/cdt/releases/indigo, waited for a while, and chose the following CDT Main Features, CDT Optional Features, and Next, then an error occurred.

Cannot complete the install because of a conflicting dependency.
  Software being installed: C/C++ DSF GDB Debugger Integration 4.0.0.201106081058 (org.eclipse.cdt.gnu.dsf.feature.group 4.0.0.201106081058)
  Software being installed: C/C++ Development Tools SDK 8.0.2.201202111925 (org.eclipse.cdt.sdk.feature.group 8.0.2.201202111925)
  Only one of the following can be installed at once: 
    GDB DSF Debugger Integration Core 4.0.0.201106081058 (org.eclipse.cdt.dsf.gdb 4.0.0.201106081058)
    GDB DSF Debugger Integration Core 4.0.2.201202111925 (org.eclipse.cdt.dsf.gdb 4.0.2.201202111925)
    GDB DSF Debugger Integration Core 4.0.1.201109151620 (org.eclipse.cdt.dsf.gdb 4.0.1.201109151620)
  Cannot satisfy dependency:
    From: C/C++ Development Tools 8.0.2.201202111925 (org.eclipse.cdt.feature.group 8.0.2.201202111925)
    To: org.eclipse.cdt.gnu.dsf.feature.group [4.0.1.201202111925]
  Cannot satisfy dependency:
    From: C/C++ DSF GDB Debugger Integration 4.0.0.201106081058 (org.eclipse.cdt.gnu.dsf.feature.group 4.0.0.201106081058)
    To: org.eclipse.cdt.dsf.gdb [4.0.0.201106081058]
  Cannot satisfy dependency:
    From: C/C++ DSF GDB Debugger Integration 4.0.1.201202111925 (org.eclipse.cdt.gnu.dsf.feature.group 4.0.1.201202111925)
    To: org.eclipse.cdt.dsf.gdb [4.0.2.201202111925]
  Cannot satisfy dependency:
    From: C/C++ Development Tools SDK 8.0.2.201202111925 (org.eclipse.cdt.sdk.feature.group 8.0.2.201202111925)
    To: org.eclipse.cdt.feature.group [8.0.2.201202111925]

i have googled for a lot of time, but still cannot find a valid solution. can anyone give a hand to me? thanks a lot!