undefined reference when writing/reading Static thread_local class member?

Question

#include <iostream>
#include <thread>
class A{
  public:
    static thread_local long l ;
    int value ;
    A(int a = 2){
       value = a;     
    }
    int foo(){
       A::l = 3;
       return 3;
    }
};
A a;
int main(){
    // A::l = 3;
     a.foo();
    return 0;
}

above code on compiling gives error can someone help to resolve them? when i remove the reads and writes to static thread_local this seems to compile . does it needs some special libraries or linkers to work properly . I need to keep static thread_local to get same features as threadLocal class in java