--- thunderbird.orig/PKGBUILD	2016-05-16 22:36:44.207704803 +0200
+++ thunderbird/PKGBUILD	2016-05-16 21:00:41.164813907 +0200
@@ -83,6 +83,9 @@
   CFLAGS+=" -fno-delete-null-pointer-checks -fno-lifetime-dse"
   CXXFLAGS+=" -fno-delete-null-pointer-checks -fno-lifetime-dse"
 
+  # Use full RELRO hardening
+  LDFLAGS+=" -Wl,-z,relro,-z,now"
+
   export PATH="$srcdir/path:$PATH"
 
   make -f client.mk build