Fixing X11 Error on macOS Catalina for AmberTools 18/19

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I was trying to install AmberTools on my macOS Catalina Installation. Running ./configure -macAccelerate clang gave me an error that it could not find X11 libraries, even though locate libXt showed that my installation was correct.

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Error:

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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.
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+          ...more info for various linuxes at ambermd.org/ubuntu.html
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+       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!
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I searched on Google for a solution. Sadly, there was not even a single thread which had a solution about this error.

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The Fix

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Simply reinstalling XQuartz using homebrew fixed the error brew cask reinstall xquartz

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If you do not have XQuartz installed, you need to run brew cask install xquartz

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