indentation flex files

I have the following vim installed, which seems not indent flex
(http://flex.sourceforge.net/) files correctly. Are there any files
that I should install for vim to indent flex files?

VIM - Vi IMproved 7.2 (2008 Aug 9, compiled Aug 16 2009 01:15:17)
MacOS X (unix) version
Included patches: 1-245
Compiled by Bjorn Winckler <bjorn.winckler@gmail.com>
Huge version with MacVim GUI. Features included (+) or not (-):
+arabic +autocmd -balloon_eval +browse ++builtin_terms +byte_offset
+cindent
+clientserver +clipboard +cmdline_compl +cmdline_hist +cmdline_info
+comments
+cryptv +cscope +cursorshape +dialog_con_gui +diff +digraphs +dnd -
ebcdic
+emacs_tags +eval +ex_extra +extra_search +farsi +file_in_path
+find_in_path
+float +folding -footer +fork() +fullscreen -gettext -hangul_input
+iconv
+insert_expand +jumplist +keymap +langmap +libcall +linebreak
+lispindent
+listcmds +localmap +menu +mksession +modify_fname +mouse +mouseshape
+mouse_dec -mouse_gpm -mouse_jsbterm +mouse_netterm -mouse_sysmouse
+mouse_xterm +multi_byte +multi_lang -mzscheme +netbeans_intg
+odbeditor
-osfiletype +path_extra -perl +postscript +printer +profile +python
+quickfix
+reltime +rightleft +ruby +scrollbind +signs +smartindent -sniff
+statusline
-sun_workshop +syntax +tag_binary +tag_old_static -tag_any_white -tcl
+terminfo
+termresponse +textobjects +title +toolbar +transparency
+user_commands
+vertsplit +virtualedit +visual +visualextra +viminfo +vreplace
+wildignore
+wildmenu +windows +writebackup -X11 -xfontset +xim -xsmp -
xterm_clipboard
-xterm_save
system vimrc file: "$VIM/vimrc"
user vimrc file: "$HOME/.vimrc"
user exrc file: "$HOME/.exrc"
system gvimrc file: "$VIM/gvimrc"
user gvimrc file: "$HOME/.gvimrc"
system menu file: "$VIMRUNTIME/menu.vim"
fall-back for $VIM: "/Applications/Vim.app/Contents/Resources/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_MACVIM -
Wall -Wno-unknown-pragmas -pipe -I. -Iproto -DMACOS_X_UNIX -no-cpp-
precomp -isysroot /Developer/SDKs/MacOSX10.4u.sdk -g -O -arch i386 -
arch ppc -I/System/Library/Frameworks/Ruby.framework/Versions/
1.8/usr/lib/ruby/1.8/universal-darwin9.0
Linking: gcc -isysroot /Developer/SDKs/MacOSX10.4u.sdk -Wl,-
syslibroot,/Developer/SDKs/MacOSX10.4u.sdk -arch i386 -arch ppc -o Vim
-framework Cocoa -framework Carbon -lncurses -liconv -
framework Python -lruby -lm

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