warning with help/Makefile

[Rudra Banerjee]

Hello friends,
 While trying to complie a package, automake gives a lot of Warning
about gnome-doc-utils.make.
It looks like:
$ autoreconf --install 
gnome-doc-utils.make:74: warning: if $(DOC_H_FILE: non-POSIX variable
name
gnome-doc-utils.make:74: (probably a GNU make extension)
help/Makefile.am:20:   'gnome-doc-utils.make' included from here
gnome-doc-utils.make:77: warning: if $(DOC_H_FILE: non-POSIX variable
name
gnome-doc-utils.make:77: (probably a GNU make extension)
....
....
help/Makefile.am:20:   'gnome-doc-utils.make' included from here
gnome-doc-utils.make:587: warning: if $(DOC_ID: non-POSIX variable name
gnome-doc-utils.make:587: (probably a GNU make extension)
help/Makefile.am:20:   'gnome-doc-utils.make' included from here
gnome-doc-utils.make:625: warning: patsubst C/%,%,$(_DOC_C_FIGURES:
non-POSIX variable name
gnome-doc-utils.make:625: (probably a GNU make extension)
help/Makefile.am:20:   'gnome-doc-utils.make' included from here

My help/makefile.am is:
include $(top_srcdir)/gnome-doc-utils.make
dist-hook: doc-dist-hook
DOC_MODULE = mkbib-manual
DOC_ENTITIES = 
DOC_INCLUDES =
DOC_FIGURES = images/mkbib.png 
#              figures/open_document.png
DOC_LINGUAS = bn_IN  en_GB
DISTCLEANFILES = \
        Makefile.in


with
$ tree 
.
|-- gnome-doc-utils.make
|-- help
|   |-- Makefile.am

as usual. gnome-doc-utils.make was copied
from /usr/share/gnome-doc-utils

I am using gnome 3.6
$automake --version
automake (GNU automake) 1.12.2