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The C compiler accepts the option '-std=c11' and responds by defining the define token '__STDC_VERSION__' = 201112 which thereby claims C11 support. Additionally, it DOES NOT define '__STDC_NO_THREADS__' and therefore the include headers <threads.h> and <stdatomic.h> should exist but they dont. The compiler is promising C11 threads, condition variables, ... support but does NOT provide it. This is NOT a link time problem, it is a compile time issue.