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+	<h1>Fixing X11 Error on macOS Catalina for AmberTools 18/19</h1>
+
+<p>I was trying to install AmberTools on my macOS Catalina Installation. Running <code>./configure -macAccelerate clang</code> gave me an error that it could not find X11 libraries, even though <code>locate libXt</code> showed that my installation was correct.</p>
+
+<p>Error:</p>
+
+<pre><code>Could not find the X11 libraries; you may need to edit config.h
+   to set the XHOME and XLIBS variables.
+Error: The X11 libraries are not in the usual location !
+       To search for them try the command: locate libXt
+       On new Fedora OS's install the libXt-devel libXext-devel
+       libX11-devel libICE-devel libSM-devel packages.
+       On old Fedora OS's install the xorg-x11-devel package.
+       On RedHat OS's install the XFree86-devel package.
+       On Ubuntu OS's install the xorg-dev and xserver-xorg packages.
+
+          ...more info for various linuxes at ambermd.org/ubuntu.html
+
+       To build Amber without XLEaP, re-run configure with '-noX11:
+            ./configure -noX11 --with-python /usr/local/bin/python3 -macAccelerate clang
+Configure failed due to the errors above!
+</code></pre>
+
+<p>I searched on Google for a solution. Sadly, there was not even a single thread which had a solution about this error.</p>
+
+<h2>The Fix</h2>
+
+<p>Simply reinstalling XQuartz using homebrew fixed the error <code>brew cask reinstall xquartz</code></p>
+
+<p>If you do not have XQuartz installed, you need to run <code>brew cask install xquartz</code></p>
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