o that then you will normally get error messages
      from your compiler similar to:
</P><PRE
CLASS="SCREEN"
>foo.c: In function `main':
foo.c:34: `PGconn' undeclared (first use in this function)
foo.c:35: `PGresult' undeclared (first use in this function)
foo.c:54: `CONNECTION_BAD' undeclared (first use in this function)
foo.c:68: `PGRES_COMMAND_OK' undeclared (first use in this function)
foo.c:95: `PGRES_TUPLES_OK' undeclared (first use in this function)</PRE
><P>
     </P
></LI
><LI
><P
>      Point you