For Windows users, you need to install GNUstep Core and MSYS System.

Command example: gcc -o hello hello.m  -fconstant-string-class=NSConstantString -I C:/GNUstep/GNUstep/System/Library/Headers/ -L C:/GNUstep/GNUstep/System/Library/Libraries/ -lobjc -lgnustep-base

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