https://svn.boost.org/trac10/ticket/13118 <p> When building all of boost (64 bit) with ICU, locale fails to link to ICU libs, while other libraries, regex included, succeed.<br /> Accidently creating a copy of &lt;ICU_root&gt;/lib64/ into &lt;ICU_root&gt;/lib/ resolved the issue.<br /> Looks like locale searches for ICU libraries in &lt;ICU&gt;/lib for both 32 and 64 bit builds, while other boost libraries use &lt;ICU&gt;/lib for 32 builds and &lt;ICU&gt;/lib64 for 64 bit builds (which is where default ICU build puts them). </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/13118 Trac 1.4.3