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Compilation fails on systems with glibc version < 2.30

2

``` pstack-2.5.1/self.cc: In member function ‘virtual void pstack::Procman::SelfProcess::listLWPs(std::function)’: pstack-2.5.1/self.cc:31:7: error: ‘gettid’ was not declared in this scope; did you mean ‘getuid’? ``` This is discussed in https://stackoverflow.com/questions/30680550/c-gettid-was-not-declared-in-this-scope And the solution:...