Can't not load libpq.so.3

I have install postgresql 7.3.4. I want to use C++ program to update my
database.

I link my program with this link option –L/usr/local/pgsql/lib.

The program is linked, but when I run it.

I have this problem

My_program: error while loading shared libraries: libpq.so.3: cannot open
shared object file: No such file or directory.

The link libpq.so.3 is the right directory /usr/local/pgsql/lib and it’s
linked to libpq.so.3.0.

What happening?

Thanks.

Sincères Salutations.

Fabien DAUMEN - Chef de projet.

NEOPOST – NBG

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