From here and here.

vim

1. Download the “VimClojure” plugin from here;

2. Unzip the package zip file to your “~/.vim/“;

3. Make sure you have the following lines into your “~/.vimrc” file:

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syntax on
filetype plugin indent on

4. Now open a clojure file in vim and you will see the syntax highlight.

gedit

1. Clone the “clojure_for_gedit” project from GitHub;

2. Run the “install.sh” script or the commands below(for my Ubuntu 12.04 specifically):

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sudo cp clojure.lang /usr/share/gtksourceview-3.0/language-specs/clojure.lang
sudo cp clojure.xml /usr/share/mime/packages/clojure.xml
cd /usr/share/
sudo update-mime-database mime

3. Open gedit again and you will see the Clojure syntax highlight.