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    <p>The linker error message indicates that you need to link against the WinSock library. Boost.Asio is a header file only library; thus, there will be no <code>boost_asio</code> library to link against.</p> <hr> <p>The following example program is designed to introduce dependencies on the WinSock library.</p> <p><code>example.cpp</code>:</p> <pre><code>#include &lt;iostream&gt; #include &lt;winsock2.h&gt; int main() { WSAStartup(WORD(), LPWSADATA()); WSACleanup(); return 0; } </code></pre> <p>When compiling <code>example.cpp</code>, but not linking to the WinSock library, the following errors occur:</p> <pre><code>C:\example&gt;mingw32-g++.exe example.cpp example.cpp:(.text+0x26): undefined reference to `WSAStartup@8' example.cpp:(.text+0x2e): undefined reference to `WSACleanup@0' collect2: ld returned 1 exit status </code></pre> <p>However, when I link against <code>ws2_32</code>, the references are resolved:</p> <pre><code>C:\example&gt;mingw32-g++.exe example.cpp -lws2_32 C:\example&gt;dir /B a.exe example.cpp </code></pre> <p>Also note that the order in which the files are specified matters. Libraries must be specified after the names of all dependent modules. In this case, <code>example.cpp</code> is dependent on <code>ws2_32</code>; therefore, <code>ws2_32</code> must appear after <code>example.cpp</code>.</p> <pre><code>C:\example&gt;mingw32-g++.exe -lws2_32 example.cpp example.cpp:(.text+0x26): undefined reference to `WSAStartup@8' example.cpp:(.text+0x2e): undefined reference to `WSACleanup@0' collect2: ld returned 1 exit status </code></pre>
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    1. POCode::Blocks and Boost Asio. It just wont work
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    1. COWhere would i find that? Sorry if I am slow to catch on.
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    2. CO@user1509040: I believe it is distributed with mingw. Try adding `ws2_32` to the list of libraries being linked.
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    3. COThere are three WS2_32 under Microsoft SDK libraries and under two sub-folders: IA64 and x64. Any suggestions?
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