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Date: Wed, 15 Sep 2010 22:06:41 +0000
From: Greg Chicares <gchicares AT sbcglobal DOT net>
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To: cygwin AT cygwin DOT com
Subject: Re: Compiling C++ code using libpq-fe.h (PostgreSQL library) in Cygwin
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On 2010-09-15 21:50Z, Julia Jacobson wrote:
> 
> When trying to compile C++ code using PostgreSQL's libpq-fe.h by the command "g++
> -I/usr/include -L/lib -lpq my_program.cpp", I get error messages like "undefined
> reference to '_PQconnectdb'.

Assuming that '-lpq' provides the unresolved symbol,
move it after the file that requires it:
  g++ -I/usr/include my_program.cpp -L/lib -lpq
See the details under '-l' in 'man ld'.

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