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GCC-10 defaults to '-fno-common' [1], which triggers issues with defining global variables multiple times. To fix the build, use 'extern' to turn the first definition of 'gladGetProcAddressPtr' into a declaration. 1. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85678 Closes https://github.com/obsproject/obs-studio/issues/2828