Can anyone please help (before I go insane). In learning C++, QT and PostgreSQL I have created a very simple program to connect to my database but I cannot compile it. I really cannot see what I am doing wrong. Postgress is running and was fully installed when I installed Redhat 7.1. The libpq++ header is truly in the specified path. I can successfully compile and connect using C. Thanks in advance. John Bend. Here is the simple program: #include <iostream> #include <libpq++.h> int main() { PgDatabase db("dbname=template1"); cout << "Program pg1.cpp finished" << endl; } I compile it with the line: g++ pg1.cpp -I/usr/include/pgsql -lpq And get the following error: /tmp/ccqlJ23X.o: In function `PgDatabase::PgDatabase(char const *)': /tmp/ccqlJ23X.o(.PgDatabase::gnu.linkonce.t.(char const *)+0x13): undefined reference to `PgConnection::PgConnection(char const *)' /tmp/ccqlJ23X.o: In function `PgDatabase::~PgDatabase(void)': /tmp/ccqlJ23X.o(.gnu.linkonce.t._._10PgDatabase+0x1d): undefined reference to `PgConnection::~PgConnection(void)' /tmp/ccqlJ23X.o: In function `PgDatabase type_info function': /tmp/ccqlJ23X.o(.gnu.linkonce.t.__tf10PgDatabase+0x10): undefined reference to `PgConnection type_info function' /tmp/ccqlJ23X.o(.gnu.linkonce.t.__tf10PgDatabase+0x18): undefined reference to `PgConnection type_info node' collect2: ld returned 1 exit status ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://www.postgresql.org/search.mpl