help me- postgres error - error while loading shared libraries - libpq.so.3

sir,
      i have installed postgresql 7.1.3 in redhat8 O.S

i can start and stop the postmaster, but

i can not create a DB using createdb command.it is

showing error

  "error while loading shared libraries - libpq.so.3"

please help me.

Thank you
Johnson


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