title: How to correctly install YouCompleteMe on mac?
body: <p>I have the following line in ~/.vimrc</p>
  
  <pre><code>Plugin 'valloric/youcompleteme'
  </code></pre>
  
  <p>Running PluginInstall successfully installed the plugin.</p>
  
  <p>Then I ran <code>python3 install.py --clang-completer</code> under <code>/Users/$UserName/.vim/bundle/youcompleteme</code>.</p>
  
  <p>Running vim gave me:</p>
  
  <blockquote>
    <p>YouCompleteMe unavailable: requires Vim compiled with Python (3.5.1+) support.</p>
  </blockquote>
  
  <p>The python3 version is 3.6.8.</p>
  
  <p><code>vim --version</code> shows that it has python3 support:</p>
  
  <pre class="lang-none prettyprint-override"><code>VIM - Vi IMproved 8.1 (2018 May 18, compiled Dec 13 2019 14:45:40)
  Included patches: 1-503, 505-680, 682-1312
  Compiled by root@apple.com
  Normal version without GUI.  Features included (+) or not (-):
  +acl               +extra_search      -mouse_netterm     -tag_old_static
  -arabic            -farsi             +mouse_sgr         -tag_any_white
  +autocmd           +file_in_path      -mouse_sysmouse    -tcl
  +autochdir         +find_in_path      -mouse_urxvt       -termguicolors
  -autoservername    +float             +mouse_xterm       +terminal
  -balloon_eval      +folding           +multi_byte        +terminfo
  -balloon_eval_term -footer            +multi_lang        +termresponse
  -browse            +fork()            -mzscheme          +textobjects
  +builtin_terms     -gettext           +netbeans_intg     +textprop
  +byte_offset       -hangul_input      +num64             +timers
  +channel           +iconv             +packages          +title
  +cindent           +insert_expand     +path_extra        -toolbar
  -clientserver      +job               -perl              +user_commands
  -clipboard         +jumplist          +persistent_undo   -vartabs
  +cmdline_compl     -keymap            +postscript        +vertsplit
  +cmdline_hist      +lambda            +printer           +virtualedit
  +cmdline_info      -langmap           -profile           +visual
  +comments          +libcall           +python/dyn        +visualextra
  -conceal           +linebreak         -python3           +viminfo
  +cryptv            +lispindent        +quickfix          +vreplace
  +cscope            +listcmds          +reltime           +wildignore
  +cursorbind        +localmap          -rightleft         +wildmenu
  +cursorshape       -lua               +ruby/dyn          +windows
  +dialog_con        +menu              +scrollbind        +writebackup
  +diff              +mksession         +signs             -X11
  +digraphs          +modify_fname      +smartindent       -xfontset
  -dnd               +mouse             +startuptime       -xim
  -ebcdic            -mouseshape        +statusline        -xpm
  -emacs_tags        -mouse_dec         -sun_workshop      -xsmp
  +eval              -mouse_gpm         +syntax            -xterm_clipboard
  +ex_extra          -mouse_jsbterm     +tag_binary        -xterm_save
     system vimrc file: "$VIM/vimrc"
       user vimrc file: "$HOME/.vimrc"
   2nd user vimrc file: "~/.vim/vimrc"
        user exrc file: "$HOME/.exrc"
         defaults file: "$VIMRUNTIME/defaults.vim"
    fall-back for $VIM: "/usr/share/vim"
  Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H   -DMACOS_X_UNIX  -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
  Linking: gcc   -L/usr/local/lib -o vim        -lm -lncurses  -liconv -framework Cocoa
  </code></pre>