diff --git a/ap/libc/glibc/glibc-2.23/benchtests/json-lib.h b/ap/libc/glibc/glibc-2.23/benchtests/json-lib.h
new file mode 100644
index 0000000..524540e
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/benchtests/json-lib.h
@@ -0,0 +1,47 @@
+/* Simple library for printing JSON data.
+   Copyright (C) 2014-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef __JSON_LIB_H__
+#define __JSON_LIB_H__
+
+#include <stdbool.h>
+#include <stdio.h>
+
+struct json_ctx
+{
+  FILE *fp;
+  unsigned int indent_level;
+  bool first_element;
+};
+
+typedef struct json_ctx json_ctx_t;
+
+void json_init (json_ctx_t *ctx, unsigned int indent_level, FILE *fp);
+void json_document_begin (json_ctx_t *ctx);
+void json_document_end (json_ctx_t *ctx);
+void json_attr_object_begin (json_ctx_t *ctx, const char *name);
+void json_attr_object_end (json_ctx_t *ctx);
+void json_attr_string (json_ctx_t *ctx, const char *name, const char *s);
+void json_attr_double (json_ctx_t *ctx, const char *name, double d);
+void json_array_begin (json_ctx_t *ctx, const char *name);
+void json_array_end (json_ctx_t *ctx);
+void json_element_double (json_ctx_t *ctx, double d);
+void json_element_object_begin (json_ctx_t *ctx);
+void json_element_object_end (json_ctx_t *ctx);
+
+#endif