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  AC_MSG_CHECKING([for Mach-O dynamic module iteration functions])
  AC_RUN_IFELSE([AC_LANG_PROGRAM([[
    #include <mach-o/dyld.h>
    #include <mach-o/loader.h>
  ]],[[
    const struct mach_header *header = _dyld_get_image_header(0);
    const char *name = _dyld_get_image_name(0);
    if (name && header) return 0;
    return 1;
  ]])],[
    AC_DEFINE([SVN_HAVE_MACHO_ITERATE], [1],
              [Is Mach-O low-level _dyld API available?])
    AC_MSG_RESULT([yes])
  ],[
    AC_MSG_RESULT([no])
  ])
])

dnl SVN_LIB_MACOS_PLIST
dnl Assign variables for Mac OS property list support
AC_DEFUN(SVN_LIB_MACOS_PLIST,
[
  AC_MSG_CHECKING([for Mac OS property list utilities])

  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
    #include <AvailabilityMacros.h>
    #if !defined(MAC_OS_X_VERSION_MAX_ALLOWED) \
     || !defined(MAC_OS_X_VERSION_10_0) \
     || (MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_0)
    #error ProperyList API unavailable.
    #endif
  ]],[[]])],[
    dnl ### Hack.  We should only need to pass the -framework options when
    dnl linking libsvn_subr, since it is the only library that uses Keychain.
    dnl
    dnl Unfortunately, libtool 1.5.x doesn't track transitive dependencies for
    dnl OS X frameworks like it does for normal libraries, so we need to
    dnl explicitly pass the option to all the users of libsvn_subr to allow
    dnl static builds to link successfully.
    dnl
    dnl This does mean that all executables we link will be linked directly
    dnl to these frameworks - even when building shared libraries - but that
    dnl shouldn't cause any problems.

    LIBS="$LIBS -framework CoreFoundation"
    AC_DEFINE([SVN_HAVE_MACOS_PLIST], [1],
              [Is Mac OS property list API available?])
    AC_MSG_RESULT([yes])
  ],[
    AC_MSG_RESULT([no])
  ])
])

dnl SVN_LIB_MACOS_KEYCHAIN
dnl Check configure options and assign variables related to Keychain support

AC_DEFUN(SVN_LIB_MACOS_KEYCHAIN,
[
  AC_ARG_ENABLE(keychain,
    AS_HELP_STRING([--disable-keychain],
    [Disable use of Mac OS KeyChain for auth credentials]),
    [enable_keychain=$enableval],[enable_keychain=yes])

  AC_MSG_CHECKING([for Mac OS KeyChain Services])

  if test "$enable_keychain" = "yes"; then
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
      #include <AvailabilityMacros.h>
      #if !defined(MAC_OS_X_VERSION_MAX_ALLOWED) \
       || !defined(MAC_OS_X_VERSION_10_2) \
       || (MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_2)
      #error KeyChain API unavailable.
      #endif
    ]],[[]])],[
      dnl ### Hack, see SVN_LIB_MACOS_PLIST
      LIBS="$LIBS -framework Security"
      LIBS="$LIBS -framework CoreServices"
      AC_DEFINE([SVN_HAVE_KEYCHAIN_SERVICES], [1], [Is Mac OS KeyChain support enabled?])
      AC_MSG_RESULT([yes])
    ],[
      enable_keychain=no
      AC_MSG_RESULT([no])
    ])
  fi
])