diff --git a/configure.ac b/configure.ac
index b3c20f9..95116a1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -137,6 +137,16 @@ fi
 ],
 [enable_secure="1"]
 )
+if test "x$enable_secure" = "x1" ; then
+  CFLAGS="$CFLAGS -fstack-protector"
+  LDFLAGS="$LDFLAGS -Wl,-z,relro,-z,now"
+
+  if test "$CFLAGS" != "${CFLAGS%-O0*}" ; then # if CFLAGS contains -O0
+      echo "WARNING: Could not apply FORTIFY_SOURCE=2 due to lack of optimization (-O0)"
+  else
+      CFLAGS="$CFLAGS -D_FORTIFY_SOURCE=2" #FORTITFY_SOURCE does not work with -O0 (ex. if enable_debug=1 or enable_gcov=1)
+  fi
+fi
 
 AC_SUBST([enable_secure])