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Editorial Team
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Asked: 2026-05-13T13:31:48+00:00

I’m trying to compile the simplest program on MacOS 10.6 like: $ g++ -o

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I’m trying to compile the simplest program on MacOS 10.6 like:

$ g++ -o hello hello.cpp

the following source:

#include <iostream>

int main (int argc, char * const argv[]) {
    std::cout << "Hello, World!\n";
    return 0;
}

I’m getting the error:

hello.cpp:1:20: error: iostream: No such file or directory
hello.cpp: In function ‘int main(int, char* const*)’:
hello.cpp:4: error: ‘cout’ is not a member of ‘std’

So obviously I have to add the include path somewhere. My question is where can I find the include directories and how can add them globally (I don’t want to provide the include path whenever I want to compile).

I just installed the XCode 3.1.4 and managed to compile it via Xcode, but not via command line. I found some header files in this directory:

/Xcode3.1.4/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/Kernel.framework/Versions/A/Headers

and tried to add it to the HEADER_SEARCH_PATHS after reading this question, but no luck.

I’m developing on Linux and everything is working fine there, but I want to continue doing that on MacOS. Any help?

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1 Answer

  1. Editorial Team

    On my Mac, that include file is in /usr/include/c++/4.0.0/iostream . Are you sure
    you have all the command-line development tools installed? They might not be by default;
    I’m pretty sure I had to install it manually when I first set up my Mac. There should be a “developer tools” package somewhere on your OS X installation media.

    Or, if you want to make sure you’re getting the latest version, you can download it from:
    http://developer.apple.com/technology/xcode.html

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