undefined reference to symbol even when nm indicates that this symbol is present in the shared library

Question

What could be wrong here? I have the following simple class:

#include  \"libmnl/libmnl.h\"

int main() {
    struct mnl_socket *a = mnl_socket_open(12);
}
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Answer 1

Libraries must be listed after the objects that use them (more precisely, a library will be used only if it contains a symbol that satisfies an undefined reference known at the time it is encountered). Move the -lmnl to the end of the command.