autocmd BufRead,BufNewFile /usr/include/*/*   setlocal filetype=c
autocmd BufRead,BufNewFile *.d   setlocal filetype=c
autocmd BufRead,BufNewFile *.dat setlocal filetype=c
autocmd BufRead,BufNewFile *.i   setlocal filetype=c
autocmd BufRead,BufNewFile *.h.merge*   setlocal filetype=c
autocmd BufRead,BufNewFile *.c.merge*   setlocal filetype=c