error while loading shared libraries: libpq.so.3

["Surabhi Ahuja " <surabhi.ahuja@xxxxxxxxxxx>]

 i have written a program sample.c
it is as folllows:

#include<stdlib.h>
#include<libpq-fe.h>

int main()
{
        PGconn *myconnection = PQconnectdb("");
        printf("Hi");
        return 0;
}

I then compile this program using makefile

make sample
cc -I/usr/local/pgsql/include    sample.c  -L/usr/local/pgsql/lib -lpq -o sample

I then run it....and it gives and error

[indra:/homes/surabi] ./sample
./sample: error while loading shared libraries: libpq.so.3: cannot open shared object file: No such file or directory

Please tell what the problem is..and how should I rectify it?