--- eclass/flag-o-matic.eclass	2009-01-21 02:05:59.000000000 +0100
+++ eclass/flag-o-matic.eclass	2009-01-28 19:36:29.000000000 +0100
@@ -80,6 +80,9 @@
 			-fno-strict-overflow)
 				gcc-specs-nostrict || continue
 				is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
+			-D_FORTIFY_SOURCE=2|-D_FORTIFY_SOURCE=1|-D_FORTIFY_SOURCE=0)
+				gcc-specs-fortify || continue
+				is-flagq -U_FORTIFY_SOURCE || append-flags -U_FORTIFY_SOURCE);;
 		esac
 	done
 }