Download Flex SDK (Free) from http://www.adobe.com/products/flex/flexdownloads/ Follow installation instructions from http://edutechwiki.unige.ch/en/Adobe_Flex download actionscriptid.vim file from http://www.vim.org/scripts/script.php?script_id=2941 follow installation instructions from http://www.vim.org/scripts/script.php?script_id=2941 install details Throwing it into you \\\"syntax\\\" directory Then adding this line to your syntax/actionscript.vim runtime! syntax/actionscriptid.vim sudo cp ~/Downloads/actionscriptid.vim /usr/share/vim/vim72/syntax/ sudo cp ~/Downloads/actionscriptid.vim /usr/share/vim/vim70/syntax/