diff --git a/admin/merge-gnulib b/admin/merge-gnulib
index 2b1a16a10ec..18c9ee8def7 100755
--- a/admin/merge-gnulib
+++ b/admin/merge-gnulib
@@ -35,10 +35,10 @@ GNULIB_MODULES='
   filemode filevercmp flexmember fstatat fsync
   getloadavg getopt-gnu gettime gettimeofday gitlog-to-changelog
   ignore-value intprops largefile lstat
-  manywarnings memrchr minmax mkostemp mktime
+  manywarnings memrchr minmax mkostemp mktime nstrftime
   pipe2 pselect pthread_sigmask putenv qcopy-acl readlink readlinkat
   sig2str socklen stat-time std-gnu11 stdalign stddef stdio
-  stpcpy strftime strtoimax symlink sys_stat
+  stpcpy strtoimax symlink sys_stat
   sys_time time time_r time_rz timegm timer-time timespec-add timespec-sub
   update-copyright unlocked-io utimens
   vla warnings
diff --git a/build-aux/config.guess b/build-aux/config.guess
index 2193702b12a..07785f54515 100755
--- a/build-aux/config.guess
+++ b/build-aux/config.guess
@@ -2,7 +2,7 @@
 # Attempt to guess a canonical system name.
 #   Copyright 1992-2017 Free Software Foundation, Inc.
 
-timestamp='2017-05-27'
+timestamp='2017-07-19'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -1429,8 +1429,8 @@ cat >&2 <<EOF
 $0: unable to guess system type
 
 This script (version $timestamp), has failed to recognize the
-operating system you are using. If your script is old, overwrite
-config.guess and config.sub with the latest versions from:
+operating system you are using. If your script is old, overwrite *all*
+copies of config.guess and config.sub with the latest versions from:
 
   http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess
 and
diff --git a/lib/gnulib.mk.in b/lib/gnulib.mk.in
index e20487b10b4..3e57391372a 100644
--- a/lib/gnulib.mk.in
+++ b/lib/gnulib.mk.in
@@ -21,7 +21,7 @@
 # the same distribution terms as the rest of that program.
 #
 # Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --avoid=close --avoid=dup --avoid=fchdir --avoid=fstat --avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow --avoid=open --avoid=openat-die --avoid=opendir --avoid=raise --avoid=save-cwd --avoid=select --avoid=setenv --avoid=sigprocmask --avoid=stat --avoid=stdarg --avoid=stdbool --avoid=threadlib --avoid=tzset --avoid=unsetenv --avoid=utime --avoid=utime-h --gnu-make --makefile-name=gnulib.mk.in --conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca-opt binary-io byteswap c-ctype c-strcase careadlinkat close-stream count-leading-zeros count-one-bits count-trailing-zeros crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 diffseq dtoastr dtotimespec dup2 environ execinfo explicit_bzero faccessat fcntl fcntl-h fdatasync fdopendir filemode filevercmp flexmember fstatat fsync getloadavg getopt-gnu gettime gettimeofday gitlog-to-changelog ignore-value intprops largefile lstat manywarnings memrchr minmax mkostemp mktime pipe2 pselect pthread_sigmask putenv qcopy-acl readlink readlinkat sig2str socklen stat-time std-gnu11 stdalign stddef stdio stpcpy strftime strtoimax symlink sys_stat sys_time time time_r time_rz timegm timer-time timespec-add timespec-sub unlocked-io update-copyright utimens vla warnings
+# Reproduce by: gnulib-tool --import --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --avoid=close --avoid=dup --avoid=fchdir --avoid=fstat --avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow --avoid=open --avoid=openat-die --avoid=opendir --avoid=raise --avoid=save-cwd --avoid=select --avoid=setenv --avoid=sigprocmask --avoid=stat --avoid=stdarg --avoid=stdbool --avoid=threadlib --avoid=tzset --avoid=unsetenv --avoid=utime --avoid=utime-h --gnu-make --makefile-name=gnulib.mk.in --conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca-opt binary-io byteswap c-ctype c-strcase careadlinkat close-stream count-leading-zeros count-one-bits count-trailing-zeros crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 diffseq dtoastr dtotimespec dup2 environ execinfo explicit_bzero faccessat fcntl fcntl-h fdatasync fdopendir filemode filevercmp flexmember fstatat fsync getloadavg getopt-gnu gettime gettimeofday gitlog-to-changelog ignore-value intprops largefile lstat manywarnings memrchr minmax mkostemp mktime nstrftime pipe2 pselect pthread_sigmask putenv qcopy-acl readlink readlinkat sig2str socklen stat-time std-gnu11 stdalign stddef stdio stpcpy strtoimax symlink sys_stat sys_time time time_r time_rz timegm timer-time timespec-add timespec-sub unlocked-io update-copyright utimens vla warnings
 
 
 MOSTLYCLEANFILES += core *.stackdump
@@ -1811,6 +1811,16 @@ EXTRA_libgnu_a_SOURCES += mktime.c
 endif
 ## end   gnulib module mktime-internal
 
+## begin gnulib module nstrftime
+ifeq (,$(OMIT_GNULIB_MODULE_nstrftime))
+
+libgnu_a_SOURCES += nstrftime.c
+
+EXTRA_DIST += strftime.h
+
+endif
+## end   gnulib module nstrftime
+
 ## begin gnulib module openat-h
 ifeq (,$(OMIT_GNULIB_MODULE_openat-h))
 
@@ -2399,16 +2409,6 @@ EXTRA_libgnu_a_SOURCES += stpcpy.c
 endif
 ## end   gnulib module stpcpy
 
-## begin gnulib module strftime
-ifeq (,$(OMIT_GNULIB_MODULE_strftime))
-
-libgnu_a_SOURCES += strftime.c
-
-EXTRA_DIST += strftime.h
-
-endif
-## end   gnulib module strftime
-
 ## begin gnulib module string
 ifeq (,$(OMIT_GNULIB_MODULE_string))
 
diff --git a/lib/strftime.c b/lib/nstrftime.c
similarity index 100%
rename from lib/strftime.c
rename to lib/nstrftime.c
diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4
index 038d78aafea..2f135773930 100644
--- a/m4/gnulib-comp.m4
+++ b/m4/gnulib-comp.m4
@@ -113,6 +113,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module mktime-internal:
   # Code from module multiarch:
   # Code from module nocrash:
+  # Code from module nstrftime:
   # Code from module openat-h:
   # Code from module pipe2:
   # Code from module pselect:
@@ -139,7 +140,6 @@ AC_DEFUN([gl_EARLY],
   # Code from module stdio:
   # Code from module stdlib:
   # Code from module stpcpy:
-  # Code from module strftime:
   # Code from module string:
   # Code from module strtoimax:
   # Code from module strtoll:
@@ -314,6 +314,7 @@ AC_DEFUN([gl_INIT],
   fi
   gl_TIME_MODULE_INDICATOR([mktime])
   gl_MULTIARCH
+  gl_FUNC_GNU_STRFTIME
   gl_FUNC_PIPE2
   gl_UNISTD_MODULE_INDICATOR([pipe2])
   gl_FUNC_PSELECT
@@ -365,7 +366,6 @@ AC_DEFUN([gl_INIT],
     gl_PREREQ_STPCPY
   fi
   gl_STRING_MODULE_INDICATOR([stpcpy])
-  gl_FUNC_GNU_STRFTIME
   gl_HEADER_STRING_H
   gl_FUNC_STRTOIMAX
   if test $HAVE_DECL_STRTOIMAX = 0 || test $REPLACE_STRTOIMAX = 1; then
@@ -893,6 +893,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/mkostemp.c
   lib/mktime-internal.h
   lib/mktime.c
+  lib/nstrftime.c
   lib/openat-priv.h
   lib/openat-proc.c
   lib/openat.h
@@ -924,7 +925,6 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/stdio.in.h
   lib/stdlib.in.h
   lib/stpcpy.c
-  lib/strftime.c
   lib/strftime.h
   lib/string.in.h
   lib/strtoimax.c
@@ -1013,6 +1013,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/mktime.m4
   m4/multiarch.m4
   m4/nocrash.m4
+  m4/nstrftime.m4
   m4/off_t.m4
   m4/pipe2.m4
   m4/pselect.m4
@@ -1037,7 +1038,6 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/stdio_h.m4
   m4/stdlib_h.m4
   m4/stpcpy.m4
-  m4/strftime.m4
   m4/string_h.m4
   m4/strtoimax.m4
   m4/strtoll.m4
diff --git a/m4/strftime.m4 b/m4/nstrftime.m4
similarity index 100%
rename from m4/strftime.m4
rename to m4/nstrftime.m4