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ImGui OpenGL loader uses dlopen / dlsym / dlclose to load the OpenGL implementation. Linking with libdl is not needed with glibc >= 2.34 (released in 2021): NEWS for version 2.34 ===================== Major new features: * In order to support smoother in-place-upgrades and to simplify the implementation of the runtime all functionality formerly implemented in the libraries libpthread, libdl, libutil, libanl has been integrated into libc. New applications do not need to link with -lpthread, -ldl, -lutil, -lanl anymore. (...) Older glibc versions and also possibly other libc implementations still need the libdl link.