I installed the pgadmin3 using the file INSTALL in the source path. After installation, with this problems, I downloaded the postgresql-libs(that has libpq.so.5) for 64 bit and manually copied the libpq.so.5 to /usr/lib64 and /usr/lib.
Did I make a mistake?
I think - you copied only the libpq.so.5.
Is that right or you also copied the other libraries too?