diff --git a/configs/rgmp/arm/nsh/appconfig b/configs/rgmp/arm/nsh/appconfig
index 092554129e9..e5220a258ee 100644
--- a/configs/rgmp/arm/nsh/appconfig
+++ b/configs/rgmp/arm/nsh/appconfig
@@ -36,6 +36,7 @@
 # Path to example in apps/examples containing the user_start entry point
 
 CONFIGURED_APPS += examples/nsh
+CONFIGURED_APPS += system/readline
 
 # The NSH Library
 
diff --git a/configs/rgmp/x86/nsh/appconfig b/configs/rgmp/x86/nsh/appconfig
index 092554129e9..e5220a258ee 100644
--- a/configs/rgmp/x86/nsh/appconfig
+++ b/configs/rgmp/x86/nsh/appconfig
@@ -36,6 +36,7 @@
 # Path to example in apps/examples containing the user_start entry point
 
 CONFIGURED_APPS += examples/nsh
+CONFIGURED_APPS += system/readline
 
 # The NSH Library
 
diff --git a/lib/string/lib_strerror.c b/lib/string/lib_strerror.c
index 61538952def..580974fa6c6 100644
--- a/lib/string/lib_strerror.c
+++ b/lib/string/lib_strerror.c
@@ -63,14 +63,14 @@ struct errno_strmap_s
 
 /* This table maps all error numbers to descriptive strings.
  * The only assumption that the code makes with regard to this
- * this table is that it is order by error number.
+ * this table is that it is ordered by error number.
  *
  * The size of this table is quite large.  Its size can be
  * reduced by eliminating some of the more obscure error
  * strings.
  */
 
-struct errno_strmap_s g_errnomap[] =
+static const struct errno_strmap_s g_errnomap[] =
 {
   { EPERM,               EPERM_STR           },
   { ENOENT,              ENOENT_STR          },