diff --git a/libc/tzcode/localtime.c b/libc/tzcode/localtime.c
index 165dd2d..0861015 100644
--- a/libc/tzcode/localtime.c
+++ b/libc/tzcode/localtime.c
@@ -178,11 +178,6 @@
 static char lcl_TZname[TZ_STRLEN_MAX + 1];
 static int  lcl_is_set;
 
-char * tzname[2] = {
-    (char *) wildabbr,
-    (char *) wildabbr
-};
-
 /*
 ** Section 4.12.3 of X3.159-1989 requires that
 **  Except for the strftime function, these functions [asctime,
@@ -193,10 +188,16 @@
 
 static struct tm	tm;
 
+#if !HAVE_POSIX_DECLS
+char *			tzname[2] = {
+	(char *) wildabbr,
+	(char *) wildabbr
+};
 #ifdef USG_COMPAT
 long			timezone;
 int			daylight;
-#endif /* defined USG_COMPAT */
+# endif
+#endif
 
 #ifdef ALTZONE
 long			altzone;
diff --git a/libc/tzcode/private.h b/libc/tzcode/private.h
index 1c176e6..941e91b 100644
--- a/libc/tzcode/private.h
+++ b/libc/tzcode/private.h
@@ -22,6 +22,10 @@
 ** You can override these in your C compiler options, e.g. '-DHAVE_GETTEXT=1'.
 */
 
+#ifndef HAVE_DECL_ASCTIME_R
+#define HAVE_DECL_ASCTIME_R 1
+#endif
+
 #ifndef HAVE_GETTEXT
 #define HAVE_GETTEXT		0
 #endif /* !defined HAVE_GETTEXT */
@@ -34,6 +38,10 @@
 #define HAVE_LINK		1
 #endif /* !defined HAVE_LINK */
 
+#ifndef HAVE_POSIX_DECLS
+#define HAVE_POSIX_DECLS 1
+#endif
+
 #ifndef HAVE_STRDUP
 #define HAVE_STRDUP 1
 #endif
@@ -106,6 +114,9 @@
 #ifndef ENAMETOOLONG
 # define ENAMETOOLONG EINVAL
 #endif
+#ifndef ENOTSUP
+# define ENOTSUP EINVAL
+#endif
 #ifndef EOVERFLOW
 # define EOVERFLOW EINVAL
 #endif
@@ -379,25 +390,21 @@
 void tzset(void);
 #endif
 
-/*
-** Some time.h implementations don't declare asctime_r.
-** Others might define it as a macro.
-** Fix the former without affecting the latter.
-** Similarly for timezone, daylight, and altzone.
-*/
-
-#ifndef asctime_r
-extern char *	asctime_r(struct tm const *restrict, char *restrict);
+#if !HAVE_DECL_ASCTIME_R && !defined asctime_r
+extern char *asctime_r(struct tm const *restrict, char *restrict);
 #endif
 
-#ifdef USG_COMPAT
-# ifndef timezone
+#if !HAVE_POSIX_DECLS
+# ifdef USG_COMPAT
+#  ifndef timezone
 extern long timezone;
-# endif
-# ifndef daylight
+#  endif
+#  ifndef daylight
 extern int daylight;
+#  endif
 # endif
 #endif
+
 #if defined ALTZONE && !defined altzone
 extern long altzone;
 #endif
diff --git a/libc/tzcode/strftime.c b/libc/tzcode/strftime.c
index 4349cf6..b1e0d1c 100644
--- a/libc/tzcode/strftime.c
+++ b/libc/tzcode/strftime.c
@@ -1,29 +1,40 @@
+/* Convert a broken-down time stamp to a string.  */
+
+/* Copyright 1989 The Regents of the University of California.
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+   1. Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+   2. Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+   3. Neither the name of the University nor the names of its contributors
+      may be used to endorse or promote products derived from this software
+      without specific prior written permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS" AND
+   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+   ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+   FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+   OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+   SUCH DAMAGE.  */
+
 /*
-** Based on the UCB version with the copyright notice and sccsid
-** appearing below.
+** Based on the UCB version with the copyright notice appearing above.
 **
 ** This is ANSIish only when "multibyte character == plain character".
 */
 
 #include "private.h"
 
-/*
-** Copyright (c) 1989 The Regents of the University of California.
-** All rights reserved.
-**
-** Redistribution and use in source and binary forms are permitted
-** provided that the above copyright notice and this paragraph are
-** duplicated in all such forms and that any documentation,
-** advertising materials, and other materials related to such
-** distribution and use acknowledge that the software was developed
-** by the University of California, Berkeley. The name of the
-** University may not be used to endorse or promote products derived
-** from this software without specific prior written permission.
-** THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
-** IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
-** WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
-*/
-
 #include "tzfile.h"
 #include "fcntl.h"
 #include "locale.h"
@@ -108,9 +119,10 @@
 static char *   _fmt(const char *, const struct tm *, char *, const char *,
             int *);
 static char *   _yconv(int, int, bool, bool, char *, const char *, int);
-static char *   getformat(int, char *, char *, char *, char *);
 
+#if !HAVE_POSIX_DECLS
 extern char *   tzname[];
+#endif
 
 #ifndef YEAR_2000_NAME
 #define YEAR_2000_NAME  "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS"
@@ -121,7 +133,17 @@
 #define IN_THIS 2
 #define IN_ALL  3
 
-#define FORCE_LOWER_CASE 0x100
+#if HAVE_STRFTIME_L
+size_t
+strftime_l(char *s, size_t maxsize, char const *format, struct tm const *t,
+	   locale_t locale)
+{
+  /* Just call strftime, as only the C locale is supported.  */
+  return strftime(s, maxsize, format, t);
+}
+#endif
+
+#define FORCE_LOWER_CASE 0x100 /* Android extension. */
 
 size_t
 strftime(char *s, size_t maxsize, const char *format, const struct tm *t)