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    <p>Sure ... C code is called from C++ all the time. For instance, most OS libraries are written in C rather than C++. So whenever you're making syscalls from your C++ code to perform tasks that are handed over to the OS kernel, those are going through C-code calls.</p> <p>Just be sure to include the proper headers and link against the C-libraries in question at compile time. Also remember to use <a href="https://stackoverflow.com/questions/1041866/in-c-source-what-is-the-effect-of-extern-c"><code>extern "C"</code></a> to specify C-linkage for the C-library functions if the header files have not already declared them as such. Keep in mind that some libraries may not have declared their functions specifically using <code>extern "C"</code>, but may have used a pre-processor token to-do so. So you'll want to check for that as well before you assume the library writers did not already define their library as having C-linkage.</p> <p>linking custom libraries using <code>gcc</code> can be done with the <code>-l</code> switch. If you need to specify a custom directory for where the libraries are located, that can be done with the <code>-L</code> switch. So for instance:</p> <pre><code>g++ -std=c++11 my_code.cpp -lmy_library -L/custom_directory_path </code></pre> <p>Note that the <code>-l</code> and <code>-L</code> switches come <em>after</em> the code or object files you're compiling, and if you're library is something like <code>libjpg</code>, or <code>librobotics</code>, etc., drop the <code>lib</code> part of the name when you append it to the <code>-l</code> switch.</p>
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    1. COWhy do you assume the headers do no do this?
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    2. COI didn't assume that ... I said "if the header files have not already declared them as such"
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    3. COName and OS or example where they have not been?
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