https://svn.boost.org/trac10/ticket/11828 <p> Use the following code to repro: #include &lt;linux/if.h&gt; #include &lt;net/if.h&gt; int main() { return 0; } </p> <p> This gives error: In file included from test.cpp:2: /usr/include/linux/if.h:187: error: field ‘ifru_addr’ has incomplete type /usr/include/linux/if.h:188: error: field ‘ifru_dstaddr’ has incomplete type /usr/include/linux/if.h:189: error: field ‘ifru_broadaddr’ has incomplete type /usr/include/linux/if.h:190: error: field ‘ifru_netmask’ has incomplete type /usr/include/linux/if.h:191: error: field ‘ifru_hwaddr’ has incomplete type In file included from test.cpp:3: /usr/include/net/if.h:45: error: expected identifier before numeric constant /usr/include/net/if.h:45: error: expected ‘}’ before numeric constant /usr/include/net/if.h:45: error: expected unqualified-id before numeric constant /usr/include/net/if.h:82: error: expected declaration before ‘}’ token </p> <p> Now, net/if.h is included in many boost headers. We are not able to use both linux/if.h and a boost library in our project for that reason. </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/11828 Trac 1.4.3