![aquamacs osx aquamacs osx](https://i.stack.imgur.com/F5rXa.png)
$ sed -i '' -e "s/Aquamacs Emacs/Emacs/g" /Applications/Mozart.app/Contents/Resources/script $ sed -i '' -e "s/Aquamacs\\\ Emacs/Emacs/g" /Applications/Mozart.app/Contents/Resources/script $ sed -i '' -e "s/Aquamacs Emacs/Emacs/g" /Applications/Mozart.app/Contents/Resources/.script Entering the following lines in Terminal appears to fix the issue for the latest build (1.4.0-macosx): $ sed -i '' -e "s/Aquamacs\\\ Emacs/Emacs/g" /Applications/Mozart.app/Contents/Resources/.script The fix is fairly simple: just modify the shell scripts so that they use Emacs rather than Aquamacs. Renaming Emacs.app to Aquamacs Emacs.app should work, but I'd recommend using the solution written below instead.)
![aquamacs osx aquamacs osx](https://news-cdn.softpedia.com/images/news2/Aquamacs-Emacs-1-4-Available-Download-Here-2.png)
It's also why the attempt to change the name of Emacs.app to Aquamacs.app did not fix the issue. (This is why Tvaroh's answer works: the script located in /Applications/Mozart.app/Contents/Resources/bin/oz is able to use GNU Emacs. Some of these scripts also attempt to use /Applications/Aquamacs.app or /Applications/Emacs.app, but do not consistently use both. The problem here is that the Mozart application uses shell scripts that are hard-coded to look for /Applications/Aquamacs Emacs.app.