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+---
+date: 2020-04-13 11:41
+description: Fixing Could not find the X11 libraries; you may need to edit config.h, AmberTools macOS Catalina
+tags: Molecular-Dynamics, macOS
+---
+
+# Fixing X11 Error on macOS Catalina for AmberTools 18/19
+
+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.
+
+Error:
+
+```
+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!
+```
+
+
+I searched on Google for a solution. Sadly, there was not even a single thread which had a solution about this error.
+
+## The Fix
+
+Simply reinstalling XQuartz using homebrew fixed the error `brew cask reinstall xquartz`
+
+If you do not have XQuartz installed, you need to run `brew cask install xquartz`