<div dir="ltr"><div><div><div><div>The problem is that b2 invokes ar.exe and ranlib.exe in &quot;/usr/x86_64-pc-cygwin/bin&quot; rather than &quot;c:/cygwin64/bin&quot;<br><br></div>Compiles and shared builds work OK because user-config.jam has this entry:<br><br>    using gcc : c++03 : c:/cygwin64/bin/g++ : &lt;cxxflags&gt;&quot;-Wconversion&quot; ;<br><br></div>As a work around, I&#39;ve created a symlink from &quot;c:/usr/x86_64-pc-cygwin/bin&quot; to &quot;c:/cygwin64/bin&quot;, and that works fine. But it would save a lot of aggravation if b2 just worked without the workaround. Incidentally, the msvc toolset does not have this problem.<br><br></div>Thanks,<br><br></div>--Beman<br></div>