Can't install HTK on linux <p>I wan't to use ALIZE for speaker recognition and after the instalation there is one of the steps: <em>feature extraction using SPRO or HTK</em> So I downloaded zip file of HTK and using terminal I configured everything, but when entering <strong>make all</strong> I'm getting this error:</p> <pre><code>/usr/bin/ld: cannot find -lX11 collect2: error: ld returned 1 exit status Makefile:56: recipe for target 'HSLab' failed make[1]: *** [HSLab] Error 1 make[1]: Leaving directory '/home/username/Downloads/htk/HTKTools' Makefile:108: recipe for target 'htktools' failed make: *** [htktools] Error 1 </code></pre> <p>what does it mean and how to fix this? I'm looking for answer for hours and can't find anything...</p> <p>I'm using HTK 3.4.1 stable version and LInux ubuntu 16.10</p>