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If your project contains VHDL 2008 files, you also have to use the 2008 version of the STD and IEEE libraries.
- Make sure your project is set to VHDL 2008 :
Right click your project and select Properties > VHDL version
- Right click the Common Libraries folder of your Sigasi Studio project and select Set Library > Reset Common Libraries
Sigasi Studio 3.6 will offer a quick-fix to make this easier.