古いVimがある環境でも共通のvimrcを使う書き方

if v:version >= 800
  echo "settings for new version!"
endif

if (v:version == 704 && has("patch786")) || v:version >= 705
  echo "settings for 7.4 + patch 786 or later"
endif

"...
" Dein
if s:use_dein && v:version >= 704
  " settings for dein
  " ...
  if (v:version == 704 && has("patch786")) || v:version >= 705
    call dein#add('itchyny/vim-parenmatch')
  endif
  " ...
  if v:version >= 800
    call dein#add('chrisbra/vim-diff-enhanced')
  endif
  " ...
endif
"...
" Colors
augroup MyColors
  autocmd!
  "...
  " Set all white characters on black background for current line
  if &cursorline
    autocmd ColorScheme * hi CursorLine cterm=underline
    autocmd InsertEnter * hi CursorLine cterm=bold
    autocmd InsertLeave * hi CursorLine cterm=underline

    " SpecialKey, needed for cursorline
    autocmd ColorScheme * hi link MySpecialKey SpecialKey
    if v:version >= 702
      autocmd VimEnter,WinEnter * let w:m_sp = matchadd("MySpecialKey", '\(\t\| \+$\)')
    else
      autocmd VimEnter,WinEnter * match MySpecialKey '\(\t\| \+$\)'
    end
  endif
  "...
  " two-byte space
  autocmd ColorScheme * hi link TwoByteSpace Error
  if v:version >= 702
    autocmd VimEnter,WinEnter * let w:m_tbs = matchadd("TwoByteSpace", '　')
  else
    autocmd VimEnter,WinEnter * 2match TwoByteSpace '　'
  end
  "...
augroup END
"...
" Ignore double-width characters
if (v:version == 704 && has("patch88")) || v:version >= 705
  set spelllang+=cjk
endif
"...
" Break indent
"if (v:version == 704 && has("patch338")) || v:version >= 705
"  set breakindent    " indent even for wrapped lines
"  " breakindent option (autocmd is necessary when new file is opened in Vim)
"  " necessary even for default(min:20,shift:0)
"  autocmd MyAutoGroup BufEnter * set breakindentopt=min:20,shift:0
"endif
"...
" No automatic break at the end of the file
if (v:version == 704 && has("patch785")) || v:version >= 705
  set nofixendofline
endif
"...