--- a/debian/rules	2016-08-04 07:30:23.965735553 +0100
--- b/debian/rules	2016-08-04 07:45:29.304987175 +0100
@@ -1,7 +1,8 @@
 #!/usr/bin/make -f
 
-override_dh_auto_build:
-	$(shell dpkg-buildflags --export=sh); dh_auto_build
+DPKG_EXPORT_BUILDFLAGS = 1
+
+include /usr/share/dpkg/buildflags.mk
 
 %:
 	dh $@