vim 74 compiled and wrong runtimepath ?

Hello,

I wanted to compile my vim in order to get the python option.

I downloaded vim74 from http://www.vim.org/sources.php and
then in /usr/local/opt/vim74 I configure like this:
./configure --with-features=huge --enable-pythoninterp
--prefix=/usr/local/opt
make -j10
make install

Then with an empty vimrc (but existing) and a ~/.vim/doc/NERD_tree.txt,
I launch the vim like so: /usr/local/opt/bin/vim
Inside vim now, I have the right runtimepath:
/home/arkadefr/.vim,/usr/local/opt/share/vim/vimfiles,/usr/local/opt/share/vim/vim74,/usr/local/opt/share/vim/vimfiles/after,/home/arkadefr/.vim/after

but even a :help NERDTree doesnt work.

I try to include a ~/.vim/plugin/python.vim but even if it is read on
the startup, it is not applied when I open a python file :( Even worse
it set variables like "set noexpandtab" even though the filetype is
right.

What can I do in order to fix it? Did I compiled / configure it right?

Thanks

PS: I'm under a debian jessie


My :version vim:
:version
VIM - Vi IMproved 7.4 (2013 Aug 10, compiled Feb 24 2015 17:50:31)
Compiled by arkadefr@online-arkadefr-desktop
Huge version with GTK2 GUI. Features included (+) or not (-):
+arabic +cmdline_info -ebcdic +fork()
+listcmds +mouse_netterm +persistent_undo +signs
+terminfo +vreplace
+autocmd +comments +emacs_tags +gettext
+localmap +mouse_sgr +postscript +smartindent
+termresponse +wildignore
+balloon_eval +conceal +eval -hangul_input
-lua -mouse_sysmouse +printer -sniff
+textobjects +wildmenu
+browse +cryptv +ex_extra +iconv
+menu +mouse_urxvt +profile +startuptime
+title +windows
++builtin_terms +cscope +extra_search +insert_expand
+mksession +mouse_xterm +python +statusline
+toolbar +writebackup
+byte_offset +cursorbind +farsi +jumplist
+modify_fname +multi_byte -python3 -sun_workshop
+user_commands +X11
+cindent +cursorshape +file_in_path +keymap
+mouse +multi_lang +quickfix +syntax
+vertsplit -xfontset
+clientserver +dialog_con_gui +find_in_path +langmap
+mouseshape -mzscheme +reltime +tag_binary
+virtualedit +xim
+clipboard +diff +float +libcall
+mouse_dec +netbeans_intg +rightleft +tag_old_static
+visual +xsmp_interact
+cmdline_compl +digraphs +folding +linebreak
-mouse_gpm +path_extra -ruby -tag_any_white
+visualextra +xterm_clipboard
+cmdline_hist +dnd -footer +lispindent
-mouse_jsbterm -perl +scrollbind -tcl +viminfo
-xterm_save
system vimrc file: "$VIM/vimrc"
user vimrc file: "$HOME/.vimrc"
2nd user vimrc file: "~/.vim/vimrc"
user exrc file: "$HOME/.exrc"
system gvimrc file: "$VIM/gvimrc"
user gvimrc file: "$HOME/.gvimrc"
2nd user gvimrc file: "~/.vim/gvimrc"
system menu file: "$VIMRUNTIME/menu.vim"
fall-back for $VIM: "/usr/local/opt/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_GTK -pthread
-I/usr/include/gtk-2.0 -I/usr/lib/x86_64-linux-gnu/gtk-2.0/include
-I/usr/include/gio-unix-2.0/
-I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/atk-1.0
-I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/libpng12
-I/usr/include/gdk-pixbuf-2.0 -
I/usr/include/libpng12 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz
-I/usr/include/pango-1.0 -I/usr/include/glib-2.0
-I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/
usr/include/freetype2 -I/usr/local/include -g -O2 -U_FORTIFY_SOURCE
-D_FORTIFY_SOURCE=1
Linking: gcc -L/usr/local/lib -Wl,--as-needed -o vim -lgtk-x11-2.0
-lgdk-x11-2.0 -lpangocairo-1.0 -latk-1.0 -lcairo -lgdk_pixbuf-2.0
-lgio-2.0 -lpangoft2-1.0 -lpango
-1.0 -lgobject-2.0 -lglib-2.0 -lfontconfig -lfreetype -lSM -lICE -lXpm
-lXt -lX11 -lXdmcp -lSM -lICE -lm -ltinfo -lnsl -lselinux -ldl
-L/usr/lib/python2.7/config-
x86_64-linux-gnu -lpython2.7 -lpthread -ldl -lutil -lm -Xlinker
-export-dynamic -Wl,-O1 -Wl,-Bsymbolic-functions

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