+# Old versions of dpkg-buildflags do not understand --export=configure.
+# When dpkg-buildflags does not understand an option, it prints its full
+# --help output on stdout, so we have to avoid that here.
+buildflags := $(shell if dpkg-buildflags --export=configure >/dev/null 2>&1; \
+ then dpkg-buildflags --export=configure; fi)
+