If you run ./autogen.sh && make, along the way you'll get this huge bunch of warnings (we shouldn't have any):


+ running automake -a -c...
gnome-doc-utils.make:74: if $(DOC_H_FILE: non-POSIX variable name
gnome-doc-utils.make:74: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:77: if $(DOC_H_FILE: non-POSIX variable name
gnome-doc-utils.make:77: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:118: if $(DOC_USER_FORMATS: non-POSIX variable name
gnome-doc-utils.make:118: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:123: if $(filter environment,$(origin LINGUAS: non-POSIX variable name
gnome-doc-utils.make:123: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:123: filter $(LINGUAS: non-POSIX variable name
gnome-doc-utils.make:123: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:134: if $(DOC_ID: non-POSIX variable name
gnome-doc-utils.make:134: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:140: shell $(PKG_CONFIG: non-POSIX variable name
gnome-doc-utils.make:140: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:171: shell xmllint --format $(2: non-POSIX variable name
gnome-doc-utils.make:171: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:171: notdir $(patsubst %/$(notdir $(2: non-POSIX variable name
gnome-doc-utils.make:171: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:171: if $(_ENABLE_SK: non-POSIX variable name
gnome-doc-utils.make:171: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:187: if $(DOC_MODULE: non-POSIX variable name
gnome-doc-utils.make:187: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:187: wildcard $(_DOC_ABS_SRCDIR: non-POSIX variable name
gnome-doc-utils.make:187: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:191: if $(_DOC_OMF_IN: non-POSIX variable name
gnome-doc-utils.make:191: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:191: foreach lc,C $(_DOC_REAL_LINGUAS: non-POSIX variable name
gnome-doc-utils.make:191: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:200: call db2omf_args,$@,$<,'docbook': non-POSIX variable name
gnome-doc-utils.make:200: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:204: if $(_DOC_OMF_IN: non-POSIX variable name
gnome-doc-utils.make:204: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:204: foreach lc,C $(_DOC_REAL_LINGUAS: non-POSIX variable name
gnome-doc-utils.make:204: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:215: call db2omf_args,$@,$<,'xhtml': non-POSIX variable name
gnome-doc-utils.make:215: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:220: if $(filter docbook,$(_DOC_REAL_FORMATS: non-POSIX variable name
gnome-doc-utils.make:220: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:220: if $(filter html HTML,$(_DOC_REAL_FORMATS: non-POSIX variable name
gnome-doc-utils.make:220: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:233: if $(DOC_MODULE: non-POSIX variable name
gnome-doc-utils.make:233: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:237: foreach page,$(DOC_PAGES: non-POSIX variable name
gnome-doc-utils.make:237: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:241: foreach ent,$(DOC_ENTITIES: non-POSIX variable name
gnome-doc-utils.make:241: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:245: foreach inc,$(DOC_INCLUDES: non-POSIX variable name
gnome-doc-utils.make:245: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:262: if $(DOC_FIGURES: non-POSIX variable name
gnome-doc-utils.make:262: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:262: foreach fig,$(DOC_FIGURES: non-POSIX variable name
gnome-doc-utils.make:262: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:262: patsubst $(srcdir: non-POSIX variable name
gnome-doc-utils.make:262: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:262: wildcard $(srcdir: non-POSIX variable name
gnome-doc-utils.make:262: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:269: foreach f,						\
gnome-doc-utils.make:269: 	$(shell xsltproc --xinclude 					\
gnome-doc-utils.make:269: 	  --stringparam db.chunk.basename "$(DOC_MODULE: non-POSIX variable name
gnome-doc-utils.make:269: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:280: if $(DOC_MODULE: non-POSIX variable name
gnome-doc-utils.make:280: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:280: foreach lc,$(_DOC_REAL_LINGUAS: non-POSIX variable name
gnome-doc-utils.make:280: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:288: patsubst %.po,%.mo,$(_DOC_POFILES: non-POSIX variable name
gnome-doc-utils.make:288: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:295: if $(DOC_MODULE: non-POSIX variable name
gnome-doc-utils.make:295: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:295: foreach lc,$(_DOC_REAL_LINGUAS: non-POSIX variable name
gnome-doc-utils.make:295: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:300: foreach lc,$(_DOC_REAL_LINGUAS: non-POSIX variable name
gnome-doc-utils.make:300: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:300: foreach page,$(_DOC_C_PAGES: non-POSIX variable name
gnome-doc-utils.make:300: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:300: notdir $(page: non-POSIX variable name
gnome-doc-utils.make:300: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:306: foreach lc,$(_DOC_REAL_LINGUAS: non-POSIX variable name
gnome-doc-utils.make:306: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:306: foreach inc,$(_DOC_C_INCLUDES: non-POSIX variable name
gnome-doc-utils.make:306: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:306: notdir $(inc: non-POSIX variable name
gnome-doc-utils.make:306: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:313: foreach lc,$(_DOC_REAL_LINGUAS: non-POSIX variable name
gnome-doc-utils.make:313: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:313: foreach doc,$(_DOC_C_HTML: non-POSIX variable name
gnome-doc-utils.make:313: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:313: notdir $(doc: non-POSIX variable name
gnome-doc-utils.make:313: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:319: if $(filter html HTML,$(_DOC_REAL_FORMATS: non-POSIX variable name
gnome-doc-utils.make:319: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:325: foreach lc,$(_DOC_REAL_LINGUAS: non-POSIX variable name
gnome-doc-utils.make:325: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:325: patsubst C/%,$(lc: non-POSIX variable name
gnome-doc-utils.make:325: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:328: foreach fig,$(_DOC_C_FIGURES: non-POSIX variable name
gnome-doc-utils.make:328: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:328: foreach lc,C $(_DOC_REAL_LINGUAS: non-POSIX variable name
gnome-doc-utils.make:328: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:328: wildcard $(srcdir: non-POSIX variable name
gnome-doc-utils.make:328: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:328: patsubst C/%,%,$(fig: non-POSIX variable name
gnome-doc-utils.make:328: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:333: dir $@: non-POSIX variable name
gnome-doc-utils.make:333: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:360: dir $@: non-POSIX variable name
gnome-doc-utils.make:360: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:367: dir $@: non-POSIX variable name
gnome-doc-utils.make:367: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:368: notdir $@: non-POSIX variable name
gnome-doc-utils.make:368: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:378: if $(DOC_MODULE: non-POSIX variable name
gnome-doc-utils.make:378: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:378: if $(DOC_ID: non-POSIX variable name
gnome-doc-utils.make:378: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:390: if $(filter html HTML,$(_DOC_REAL_FORMATS: non-POSIX variable name
gnome-doc-utils.make:390: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:393: foreach lc,C $(_DOC_REAL_LINGUAS: non-POSIX variable name
gnome-doc-utils.make:393: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:396: patsubst %.xhtml,%.xml,$@: non-POSIX variable name
gnome-doc-utils.make:396: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:441: if $(_DOC_OMF_IN: non-POSIX variable name
gnome-doc-utils.make:441: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:442: if $(_DOC_DSK_IN: non-POSIX variable name
gnome-doc-utils.make:442: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:443: if $(_DOC_REAL_LINGUAS: non-POSIX variable name
gnome-doc-utils.make:443: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:444: if $(DOC_MODULE: non-POSIX variable name
gnome-doc-utils.make:444: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:587: if $(DOC_ID: non-POSIX variable name
gnome-doc-utils.make:587: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
gnome-doc-utils.make:625: patsubst C/%,%,$(_DOC_C_FIGURES: non-POSIX variable name
gnome-doc-utils.make:625: (probably a GNU make extension)
help/Makefile.am:1:   `gnome-doc-utils.make' included from here
tests/Makefile.am:38: `%'-style pattern rules are a GNU make extension