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    AC_MSG_RESULT([yes])
    ac_cv_ios_10="yes"
  ],[
    AC_MSG_RESULT([no])
  ])
])

dnl macOS 10.12?
AS_IF([test "x$host_vendor" = "xapple"], [
  AC_MSG_CHECKING([for macOS minimum version 10.12 or later])
  AC_COMPILE_IFELSE([
    AC_LANG_PROGRAM([[
#include <stdio.h>
#include <TargetConditionals.h>
    ]], [[
#ifndef MAC_OS_X_VERSION_10_12
#  define MAC_OS_X_VERSION_10_12 101200
#endif
#if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_12
#error Not macOS 10.12 or later
#endif
return 0;
   ]])
  ],[
    AC_MSG_RESULT([yes])
    ac_cv_macos_10_12="yes"
  ],[
    AC_MSG_RESULT([no])
  ])
])

dnl **********************************************************************
dnl In case that function clock_gettime with monotonic timer is available,
dnl check for additional required libraries.
dnl **********************************************************************
dnl Xcode 8 bug: iOS when targeting less than 10, or macOS when targeting less than 10.12 will
dnl say clock_gettime exists, it is a weak symbol that only exists in iOS 10 or macOS 10.12 and will
dnl cause a crash at runtime when running on older versions.  Skip finding CLOCK_MONOTONIC on older
dnl Apple OS's.
if test "x$host_vendor" != "xapple" || test "x$ac_cv_ios_10" = "xyes" || test "x$ac_cv_macos_10_12" = "xyes"; then
  CURL_CHECK_LIBS_CLOCK_GETTIME_MONOTONIC
fi

AC_MSG_CHECKING([whether to use libgcc])
AC_ARG_ENABLE(libgcc,
AC_HELP_STRING([--enable-libgcc],[use libgcc when linking]),
[ case "$enableval" in
  yes)
        LIBS="$LIBS -lgcc"
       AC_MSG_RESULT(yes)
       ;;
  *)   AC_MSG_RESULT(no)
       ;;
  esac ],
       AC_MSG_RESULT(no)
)


dnl Let's hope this split URL remains working:
dnl http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixprggd/ \
dnl genprogc/thread_quick_ref.htm


dnl **********************************************************************
dnl Back to "normal" configuring
dnl **********************************************************************

dnl Checks for header files.
AC_HEADER_STDC

CURL_CHECK_HEADER_MALLOC
CURL_CHECK_HEADER_MEMORY

dnl check for a few basic system headers we need
AC_CHECK_HEADERS(
       sys/types.h \
       sys/time.h \
       sys/select.h \
       sys/socket.h \
       sys/ioctl.h \
       sys/param.h \
       sys/uio.h \
       assert.h \
       netdb.h \
       netinet/in.h \
       netinet/tcp.h \
       net/if.h \
       errno.h \
       socket.h \
       strings.h \
       stdbool.h \
       time.h \
       limits.h \
       arpa/nameser.h \
       arpa/nameser_compat.h \
       arpa/inet.h,
dnl to do if not found
[],
dnl to do if found
[],
dnl default includes
[
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
dnl We do this default-include simply to make sure that the nameser_compat.h
dnl header *REALLY* can be include after the new nameser.h. It seems AIX 5.1
dnl (and others?) is not designed to allow this.
#ifdef HAVE_ARPA_NAMESER_H
#include <arpa/nameser.h>
#endif

dnl *Sigh* these are needed in order for net/if.h to get properly detected.
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>