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Sorry for my rudimentary question. Environment: ・Xcode 15.3 ・C++ ・Freeglut 3.4.0 ・XQuartz 2.8.6_beta2 (already started) Current status: The following problems occurred at the time of upgrading from Xcode 14.2 to Xcode 15.3. Despite setting DISPLAY appropriately in the user environment variable, an error message " failed to open display '' " is thrown when RUN with Xcode. However, if I run the binary built with Xcode directly in the terminal, it works fine. Question: Why is the DISPLAY environment variable not being passed to Xcode internals properly when RUN in Xcode?