diff --git a/rtems/config/rtems-gcc-4.7.2-newlib-1.20.0-1.cfg b/rtems/config/rtems-gcc-4.7.2-newlib-1.20.0-1.cfg
index cb1dcf6..59d7ec8 100644
--- a/rtems/config/rtems-gcc-4.7.2-newlib-1.20.0-1.cfg
+++ b/rtems/config/rtems-gcc-4.7.2-newlib-1.20.0-1.cfg
@@ -35,6 +35,15 @@
 %define enable_cxx 1
 %endif
 
+#
+# If arm-rtems4.11 add --enable-obsolete.
+#
+%if %{_target} == arm-rtems4.11
+%define enable_obsolete 1
+%else
+%define enable_obsolete 0
+%endif
+
 #
 # The RTEMS 4.11 patches
 #
diff --git a/source-builder/config/gcc-4.7-1.cfg b/source-builder/config/gcc-4.7-1.cfg
index 30b3d5e..519e2c8 100644
--- a/source-builder/config/gcc-4.7-1.cfg
+++ b/source-builder/config/gcc-4.7-1.cfg
@@ -148,6 +148,9 @@ Source22: ftp://ftp.gnu.org/gnu/gmp/gmp-%{gmp_version}.tar.bz2
     %{?with_plugin:--enable-plugin}%{!?with_plugin:--disable-plugin} \
     --enable-newlib-io-c99-formats \
     %{?with_iconv:--enable-newlib-iconv} \
+%if %{enable_obsolete}
+    --enable-obsolete \
+%endif
     --enable-languages="$languages"
 
 %if "%_host" != "%_build"