[GENERAL] trying to use libpq in Ubuntu

[Henri De Feraudy]

Hello,
 I have developed an application in C++ under Qt in Windows XP, now I would 
like 
to port it to Ubuntu GNU/Linux.
Choosing the libraries in Windows was a piece of cake: the bottom of  my Qt 
qmake project file was
win32 { 
    LIBS += "C:\Progra~1\PostgreSQL\8.4\lib\libpq.lib"
    INCLUDEPATH += "C:\Progra~1\PostgreSQL\8.4\include"
}
linux-g++ { 
    LIBS += /usr/lib/libpq.a
    INCLUDEPATH += /usr/include/postgresql
}

This works fine in Windows, but in Ubuntu there are more than a hundred 
undefined symbols, like references to ldap
Does anyone have a sample project file or suggestions?

Thankyou 
Henri