--- a/configure.ac
+++ b/configure.ac
@@ -1491,26 +1491,6 @@
 	wireshark_man=""
 fi
 
-if test "$have_gtk" = "yes" ; then
-	# If we have GTK then add flags for it.
-
-	CPPFLAGS="-DGDK_PIXBUF_DISABLE_DEPRECATED $CPPFLAGS"
-	CPPFLAGS="-DGDK_DISABLE_DEPRECATED $CPPFLAGS"
-	if test \( $gtk_config_major_version -eq 3 -a $gtk_config_minor_version -ge 10 \) ; then
-		## Allow use of deprecated & disable deprecated warnings if Gtk >= 3.10;
-		##  The deprecations in Gtk 3.10 will not be fixed ...
-		CPPFLAGS="-DGDK_DISABLE_DEPRECATION_WARNINGS $CPPFLAGS"
-	else
-		CPPFLAGS="-DGTK_DISABLE_DEPRECATED $CPPFLAGS"
-	fi
-	CPPFLAGS="-DGTK_DISABLE_SINGLE_INCLUDES $CPPFLAGS"
-	if test ! \( $gtk_config_major_version -eq 2 -a $gtk_config_minor_version -lt 20 \) ; then
-		# Enable GSEAL when building with GTK > 2.20
-		# (Versions prior to 2.22 lacked some necessary accessors.)
-		CPPFLAGS="-DGSEAL_ENABLE $CPPFLAGS"
-	fi
-fi
-
 # XXX - Is this really necessary?  When we build with both Gtk+ and Qt it works...
 if test "$use_glib_cflags" = "true"; then
 	# Use GLIB_CFLAGS