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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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