Compiling gtk+ 3.9.2 getting make error *** missing seperator: Stop

[mf fe <mf_in_ha gmx de>]

Hello,

i’ve tried compiling gtk+ 3.9.2 with the broadway backend enabled, 
because I’m interested in testing the LibreOffice in the Browser.
After doing all that preliminary stuff autogen.sh works properly 
(Configuration see below).
But when I try make I got this annoying error:

…
make[4]: Entering directory `/root/gtk+-3.9.2/gdk'
GEN gdkconfig.h
make[4]: Leaving directory `/root/gtk+-3.9.2/gdk'
make[3]: Leaving directory `/root/gtk+-3.9.2/gdk'
make[2]: Leaving directory `/root/gtk+-3.9.2/gdk'
Making all in gtk
make[2]: Entering directory `/root/gtk+-3.9.2/gtk'
Makefile:6400: *** missing separator. Schluss.
make[2]: Leaving directory `/root/gtk+-3.9.2/gtk'
make[1]: *** [all-recursive] Fehler 1
make[1]: Leaving directory `/root/gtk+-3.9.2'
make: *** [all] Fehler 2

Switching into the gtk directory and trying make results into the same 
error.

This is what’s around line 6400 in the Makefile:
…
6392
6393 gtkbuiltincache.h: stamp-icons
6394 # $(AM_V_at) $(MAKE) $(AM_MAKEFLAGS) -C native/
6395 $(AM_V_at) $(MAKE) $(AM_MAKEFLAGS) gtk-update-icon-cache$(EXEEXT)
6396 $(AM_V_GEN) $(gtk_update_icon_cache_program) --quiet --force 
--ignore-theme-index \
6397 --source builtin_icons stock-icons > gtkbuiltincache.h.tmp && \
6398 mv gtkbuiltincache.h.tmp gtkbuiltincache.h
6399
6400 @GSETTINGS_RULES@
6401
6402 install-data-local:
6403
…

I’m not familiar with make.
I’ve read several things about whitespaces and so on.
I’ve tried some unexpand and expand the file; I’ve tried putting lines 
6396-6398 into one line. No result.
I’ve commented line 6400 but that doesn’t work.

I’m realy sorry, but at the present moment I have no idea what’s going 
wrong.
Any help would be appreciated.

Regards Sebastian

Configuration
- CentOS 6.4, basic installation
- make 3.81
- Preliminary stuff
1. cairo ./autogen.sh --prefix=/opt/gtk3 && make && make install
2. glib ./autogen.sh --prefix=/opt/gtk3 && make && make install
3. shared-mime-info ./autogen.sh --prefix=/opt/gtk3 && make && make install
4. gdkpixbuf ./configure --prefix=/opt/gtk3 && make && make install
5. ragel ./configure --prefix=/opt/gtk3 && make && make install
6. harfbuzz ./autogen.sh --prefix=/opt/gtk3 && make && make install
7. pango ./autogen.sh --prefix=/opt/gtk3 && make && make install
8. atk ./configure --prefix=/opt/gtk3 && make && make install
9. at-spi2-core ./configure --prefix=/opt/gtk3 && make && make install
10. at-spi2-atk ./configure --prefix=/opt/gtk3 && make && make install
11. gobject-instrospection ./configure --prefix=/opt/gtk3 && make && 
make install
12. cp gobject-introspection/m4/introspection.m4 gtk+-3.9.2/m4/
siehe hier https://live.gnome.org/GObjectIntrospection/AutotoolsIntegration
13. cp gdk-pixbuf-2.29.0/gdk-pixbuf/GdkPixbuf-2.0.gir 
/opt/gtk3/share/gir-1.0
14. cp pango-1.34.1/pango/Pango-1.0.gir /opt/gtk3/share/gir-1.0
15. gtk ./autogen.sh --prefix=/opt/gtk3 --enable-broadway-backend
-