Linked from the Forum topic "HEW for GR-Sakura (http://renesasrulz.com/app_kits_and_demo_boards/gadget_renesas_user_forum/f/128/t/3846.aspx)
In a nutshell: You have to add a new build phase. This will execute the rx-elf-objcopy command.
Detailed instructions follows:
1. Select menu item Build / Build Phases then
2. Select menu item: Build / MyPhase and set Options as: -v -O binary $(CONFIGDIR)\$(PROJECTNAME).x $(PROJDIR)\sketch.bin3. Click on Output Files, then Add: $(PROJDIR)\sketch.bin4. Click on Dependent Files, then Add: $(CONFIGDIR)\$(PROJECTNAME).x