After a successful integration, you should be able to use Intel C++ compiler to build your project in Eclipse 3.5. For more details on how to integrate into Eclipse, please refer to section 5 "Eclipse Integration" in the product release notes http://software.intel.com/en-us/articles/intel-c-compiler-111-release-notes/. Hope this helps.
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Tools Knowledge Base: http://software.intel.com/en-us/articles/tools