https://svn.boost.org/trac10/ticket/7612 <p> I found that adding "#include &lt;boost/units/systems/si/codata_constants.hpp&gt;" to my program will cause it to fail compilation with a huge amount of template errors. This used to work on version 1.46 but fails on version 1.47 and every version after including 1.52.beta. I am using gcc 4.7.1 on OpenSUSE 12.2. The test program is used to determine which version works is: </p> <p> #include &lt;boost/units/systems/si/codata_constants.hpp&gt; </p> <p> #include &lt;iostream&gt; </p> <p> int main(int argc, char<strong> argv) { </strong></p> <blockquote> <p> std::cout &lt;&lt; "Hello." &lt;&lt; std::endl; return 0; </p> </blockquote> <p> } </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/7612 Trac 1.4.3