Building nautilus 2.91

[Stefano Facchini <stefano facchini gmail com>]

Hi,
I am trying to build nautilus from git source.
Since I have already built the latest version of gnome-shell, I tried
the following:

$
PKG_CONFIG_PATH="/home/stefano/gnome-shell/install/lib64/pkgconfig:/home/stefano/gnome-shell/install/share/pkgconfig" ./autogen --prefix=/home/stefano/nautilus

which completed without errors.
Then I tried the following:

$ make

but this immediately gives this error:

make  all-recursive
make[1]: Entering directory `/home/stefano/nautilus-src'
Making all in eel
make[2]: Entering directory `/home/stefano/nautilus-src/eel'
  GEN    eel-marshal.c
  GEN    eel-marshal.h
make  all-am
make[3]: Entering directory `/home/stefano/nautilus-src/eel'
  CC     eel-canvas.lo
cc1: warnings being treated as errors
eel-canvas.c: In function 'eel_canvas_draw_background':
eel-canvas.c:2962:2: error: implicit declaration of function
'gtk_widget_get_style'
eel-canvas.c:2962:2: error: nested extern declaration of
'gtk_widget_get_style'
eel-canvas.c:2962:77: error: invalid type argument of '->' (have 'int')
make[3]: *** [eel-canvas.lo] Error 1
make[3]: Leaving directory `/home/stefano/nautilus-src/eel'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/home/stefano/nautilus-src/eel'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/stefano/nautilus-src'
make: *** [all] Error 2

What am I doing wrong?
thank you