diff --git a/Misc/NEWS.d/next/Build/2017-11-21-17-12-24.bpo-28762.R6uu8w.rst b/Misc/NEWS.d/next/Build/2017-11-21-17-12-24.bpo-28762.R6uu8w.rst
new file mode 100644
index 0000000..0c57e33
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2017-11-21-17-12-24.bpo-28762.R6uu8w.rst
@@ -0,0 +1 @@
+Revert the last commit, the F_LOCK macro is defined by Android Unified Headers.
diff --git a/configure b/configure
index 969e1d5..d026757 100755
--- a/configure
+++ b/configure
@@ -11147,7 +11147,7 @@
  getgrouplist getgroups getlogin getloadavg getpeername getpgid getpid \
  getpriority getresuid getresgid getpwent getspnam getspent getsid getwd \
  if_nameindex \
- initgroups kill killpg lchmod lchown linkat lstat lutimes mmap \
+ initgroups kill killpg lchmod lchown lockf linkat lstat lutimes mmap \
  memrchr mbrtowc mkdirat mkfifo \
  mkfifoat mknod mknodat mktime mremap nice openat pathconf pause pipe2 plock poll \
  posix_fallocate posix_fadvise pread \
@@ -12581,35 +12581,6 @@
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
 
-# Issue #28762: lockf() is available on Android API level 24, but the F_LOCK
-# macro is not defined in android-ndk-r13.
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for lockf" >&5
-$as_echo_n "checking for lockf... " >&6; }
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <unistd.h>
-int
-main ()
-{
-lockf(0, F_LOCK, 0);
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-
-$as_echo "#define HAVE_LOCKF 1" >>confdefs.h
-
-   { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
-$as_echo "yes" >&6; }
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-
-fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-
 # On OSF/1 V5.1, getaddrinfo is available, but a define
 # for [no]getaddrinfo in netdb.h.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for getaddrinfo" >&5
diff --git a/configure.ac b/configure.ac
index 6a69f78..68a95c3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3415,7 +3415,7 @@
  getgrouplist getgroups getlogin getloadavg getpeername getpgid getpid \
  getpriority getresuid getresgid getpwent getspnam getspent getsid getwd \
  if_nameindex \
- initgroups kill killpg lchmod lchown linkat lstat lutimes mmap \
+ initgroups kill killpg lchmod lchown lockf linkat lstat lutimes mmap \
  memrchr mbrtowc mkdirat mkfifo \
  mkfifoat mknod mknodat mktime mremap nice openat pathconf pause pipe2 plock poll \
  posix_fallocate posix_fadvise pread \
@@ -3764,15 +3764,6 @@
   AC_MSG_RESULT(no)
 ])
 
-# Issue #28762: lockf() is available on Android API level 24, but the F_LOCK
-# macro is not defined in android-ndk-r13.
-AC_MSG_CHECKING(for lockf)
-AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h> ]],[[lockf(0, F_LOCK, 0);]])],
-  [AC_DEFINE(HAVE_LOCKF, 1, Define to 1 if you have the 'lockf' function and the F_LOCK macro.)
-   AC_MSG_RESULT(yes)],
-  [AC_MSG_RESULT(no)
-])
-
 # On OSF/1 V5.1, getaddrinfo is available, but a define
 # for [no]getaddrinfo in netdb.h.
 AC_MSG_CHECKING(for getaddrinfo)
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 6e0f3e8..66b9e88 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -601,7 +601,7 @@
 /* Define to 1 if you have the <linux/vm_sockets.h> header file. */
 #undef HAVE_LINUX_VM_SOCKETS_H
 
-/* Define to 1 if you have the 'lockf' function and the F_LOCK macro. */
+/* Define to 1 if you have the `lockf' function. */
 #undef HAVE_LOCKF
 
 /* Define to 1 if you have the `log1p' function. */