Eclipse Path to Include Directories not working for me (Windows 7-64, C++) - eclipse

Question

I installed GCC (4.8.1) this morning and Eclipse Kepler (SR2). My Hello World compiled and ran fine, so I'm moving toward my goal of writing a C++ app using Boost. I installed Boost to "C:\Program Files\boost\boost_1_55_0" and added this path to Project>Properties>C/C++ General>Paths and Symols>[tab]Includes>GNU C++. However, when I compile, the path isn't showing up in the g++ command line, so understandably, the header file isn't getting found.
15:55:24 **** Incremental Build of configuration Debug for project BoostApp ****
Info: Internal Builder is used for build
g++ -O0 -g3 -Wall -c -fmessage-length=0 -o "src\\BoostApp.o" "..\\src\\BoostApp.cpp"
..\src\BoostApp.cpp:1:32: fatal error: boost/filesystem.hpp: No such file or directory
#include "boost/filesystem.hpp"
^
compilation terminated.
15:55:24 Build Finished (took 78ms)
I realize this is a newb question and spent a few hours searching around and finding mostly direction to set the path, which I've done. I've checked the install and the header file is there. I've also done my own command line compile adding "-I C:\Program Files\boost\boost_1_55_0" to the command line and GCC found the header file fine.
Not sure where I'm going wrong. As mentioned, it's a new install of GCC, Eclipse, and Boost, so maybe I went wrong somewhere during the install or maybe creating the project? Or just a newb question? Below is the app I'm compiling which I copied from rosettacode.com
#include "boost/filesystem.hpp"
#include "boost/regex.hpp"
#include <iostream>
using namespace boost::filesystem;
int main()
{
path current_dir("."); //
boost::regex pattern("a.*"); // list all files starting with a
for (recursive_directory_iterator iter(current_dir), end;
iter != end;
++iter)
{
std::string name = iter->path().filename().string();
if (regex_match(name, pattern))
std::cout << iter->path() << "\n";
}
}