g++: error: unrecognized command line option '-mt'
<p>I'm trying to compile a program from source. In an OpenSuse 12.1 chroot the program compiles fines, but in an OpenSuse leap 42.1 chroot I get the following error:</p>

<pre><code>g++: error: unrecognized command line option '-mt'
</code></pre>

<p>I've searched (both on here and on google) but couldn't find much information on the -mt flag. What is this '-mt' flag? </p>