Use gecko.m4 from epiphany, which has 1.9 compatibility.

lib/python/Makefile.am

@@ -1,8 +1,10 @@
-INCLUDES =				\
-	$(PYTHON_INCLUDES)		\
-	$(PYGTK_CFLAGS)			\
+INCLUDES =					\
+	$(PYTHON_INCLUDES)			\
+	$(PYGTK_CFLAGS)				\
 	$(PYCAIRO_CFLAGS)			\
-	$(LIB_CFLAGS)			\
+	$(LIB_CFLAGS)				\
+	$(GECKO_CFLAGS)				\
+	-I$(MOZILLA_INCLUDE_ROOT)/gtkembedmoz   \
 	-I $(top_srcdir)/lib/src
 
 pkgpyexecdir = $(pythondir)

lib/src/Makefile.am

@@ -1,10 +1,15 @@
 libsugarprivate_la_CPPFLAGS =			\
 	$(WARN_CFLAGS)				\
 	$(LIB_CFLAGS)				\
-	-I$(MOZILLA_INCLUDE_DIR)/exthandler	\
-	-I$(MOZILLA_INCLUDE_DIR)/mimetype   	\
-	-I$(MOZILLA_INCLUDE_DIR)/necko		\
-	-I$(MOZILLA_INCLUDE_DIR)/uriloader	\
+	$(GECKO_CFLAGS)				\
+	-I$(MOZILLA_INCLUDE_ROOT)/exthandler	\
+	-I$(MOZILLA_INCLUDE_ROOT)/dom		\
+	-I$(MOZILLA_INCLUDE_ROOT)/gtkembedmoz   \
+	-I$(MOZILLA_INCLUDE_ROOT)/mimetype   	\
+	-I$(MOZILLA_INCLUDE_ROOT)/necko		\
+	-I$(MOZILLA_INCLUDE_ROOT)/pref		\
+	-I$(MOZILLA_INCLUDE_ROOT)/uriloader	\
+	-I$(MOZILLA_INCLUDE_ROOT)/webbrwsr	\
 	-DSHARE_DIR=\"$(pkgdatadir)\"
 
 noinst_LTLIBRARIES = libsugarprivate.la