g++ no longer finding standard libraries OSX 10.6.8 - c++

Question

no solutions I found on the internet have worked so far.
I am running OSX 10.6.8. I had previously been using the gnu compiler for C/C++ fine. I switched to XCode and have no problem with that but I would like to use the command line. However, after wiping my computer and restoring from a backup I was getting the error bash: g++ command not found.
First, I figured my $PATH got a bit wonky, so I tried to add in the correct path to the Path variable and now it recognizes g++ and tries to compile. But, I get this error now:
hello.cpp:3:20: error: iostream: No such file or directory
hello.cpp: In function ‘int main()’:
hello.cpp:8: error: ‘cout’ is not a member of ‘std’
Here is the Hello World! code:
#include <iostream>
int main ()
{
std::cout << "Hello World!";
return 0;
}
Solutions that have been posted online have mainly been problems with namespaces and #include statements but I do not believe this to be the error at this time.
when I type "which g++" into Terminal I get: /Developer/usr/bin/g++
and when I type g++ -v I get:
Using built-in specs.
Target: i686-apple-darwin10
Configured with: /var/tmp/gcc/gcc-5666.3~6/src/configure --disable-checking --enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ --with-slibdir=/usr/lib --build=i686-apple-darwin10 --program-prefix=i686-apple-darwin10- --host=x86_64-apple-darwin10 --target=i686-apple-darwin10 --with-gxx-include-dir=/include/c++/4.2.1
Thread model: posix
gcc version 4.2.1 (Apple Inc. build 5666) (dot 3)
4.2.1 is an older version so if there is one thing I could change it would be switching to 4.7.2 which I found in usr/local/Cellar/gcc. I am not sure what Cellar is perhaps that comes from when I tried using homebrew to install gcc as I found on some other forum.
Thanks in advance, this is beyond my ken.

Answer 1

When you installed XCode, you simply forgot to check that little checkbox that says "install Unix command line utilities." When you do that, you'll get a fully working GCC installed in /usr/. The one installed in /Developer/ is not for command-line use. It's only for the XCode graphical IDE.