faq-using-sbgrid-programs.md
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@@ -35,10 +35,13 @@ emulate an 8-bit color scheme for running applications such as WEB.
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If you need to download a newer version of X11 for OS X, you can find the
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binaries here: <http://xquartz.macosforge.org/trac/wiki>
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-To enable GL required by some programs like coot you will need to run this in a terminal from your account.
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+To enable GL required by some programs like coot you will need to run
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+this in a terminal from your account on your Mac:
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+
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```
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defaults write org.macosforge.xquartz.X11 enable_iglx -bool true
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```
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+Then stop and restart XQuartz.
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## Running SBGrid Programs
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