OSX + iTerm + screen + vim + 256 colors

screen vim osx

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screen (Git!!!!)

% git clone git://git.savannah.gnu.org/screen.git
% cd screen/src
% ./autogen.sh 
% ./configure --prefix=/usr/local \
   --enable-telnet \
   --enable-pam \
   --enable-colors256 \
   --enable-rxvt_osc \
   --enable-use-locale
% sudo make && sudo make install

.screenrc

#terminfo and termcap for nice 256 color terminal
# allow bold colors - necessary for some reason
attrcolor b ".I"
# tell screen how to set colors. AB = background, AF=foreground
termcapinfo xterm* "Co#256:AB=\E[48;5;%dm:AF=\E[38;5;%dm"
# erase background with current bg color
defbce "on"


.vimrc

if 200 < &t_Co || &term ==# 'screen-bce'
  set t_Co=256
  colorscheme wombat256
endif

参考
http://pjkh.com/articles/2008/07/09/osx-iterm-screen-vim-256-colors/