diff --git a/ap/libc/glibc/glibc-2.23/stdlib/putenv.c b/ap/libc/glibc/glibc-2.23/stdlib/putenv.c
new file mode 100644
index 0000000..71b9ab1
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/stdlib/putenv.c
@@ -0,0 +1,87 @@
+/* Copyright (C) 1991-2016 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/>.  */
+
+#if defined _AIX && !defined __GNUC__
+ #pragma alloca
+#endif
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#if _LIBC || HAVE_STDLIB_H
+# include <stdlib.h>
+#endif
+#if _LIBC || HAVE_STRING_H
+# include <string.h>
+#endif
+
+#if !__GNU_LIBRARY__ && !HAVE_STRCHR
+# define strchr index
+#endif
+
+#ifndef _LIBC
+# ifdef HAVE_ALLOCA_H
+#  include <alloca.h>
+# else
+#  ifdef __GNUC__
+#   define alloca __builtin_alloca
+#  else
+extern char *alloca ();
+#  endif /* __GNUC__ */
+# endif /* HAVE_ALLOCA_H */
+#endif /* _LIBC */
+
+
+/* Put STRING, which is of the form "NAME=VALUE", in the environment.  */
+int
+putenv (char *string)
+{
+  const char *const name_end = strchr (string, '=');
+
+  if (name_end != NULL)
+    {
+      char *name;
+#ifdef _LIBC
+      int use_malloc = !__libc_use_alloca (name_end - string + 1);
+      if (__builtin_expect (use_malloc, 0))
+	{
+	  name = strndup (string, name_end - string);
+	  if (name == NULL)
+	    return -1;
+	}
+      else
+	name = strndupa (string, name_end - string);
+#else
+# define use_malloc 1
+      name = malloc (name_end - string + 1);
+      if (name == NULL)
+	return -1;
+      memcpy (name, string, name_end - string);
+      name[name_end - string] = '\0';
+#endif
+      int result = __add_to_environ (name, NULL, string, 1);
+
+      if (__glibc_unlikely (use_malloc))
+	free (name);
+
+      return result;
+    }
+
+  __unsetenv (string);
+  return 0;
+}