"Mohamed Yassin Eltabakh" <meltabak@xxxxxxxxxxxxx> writes: > I updated the src/backend/parser/Makefile and added "new.o" to the OBJS > list, but when I compile I receive error: > ....undefined reference to `PSQLexec' > ....undefined reference to `PQntuples' > ....undefined reference to `PQclear' You seem to be trying to use the libpq client from inside the backend. This is entirely inappropriate. If you need to run general-purpose SQL queries you can use SPI, but code that is doing that probably does not belong in /parser. Just about anything that makes sense to do during parse analysis should be adequately supported by the system catalog cache routines. regards, tom lane