if test $CROSS_COMPILING = no; then

case $host_os in

darwin*)

macosx_version=`sw_vers -productVersion`

test $? -eq 0 || {

AC_MSG_ERROR([Failed to execute 'sw_vers'; please provide it in PATH])

}

[case "$macosx_version" in

[1-9][0-9].[0-9])

int_macosx_version=`echo $macosx_version | sed 's|\([^\.]*\)\.\([^\.]*\)|\10\200|'`;;

[1-9][0-9].[0-9].[0-9])

int_macosx_version=`echo $macosx_version | sed 's|\([^\.]*\)\.\([^\.]*\)\.\([^\.]*\)|\10\20\3|'`;;

[1-9][0-9].[1-9][0-9])

int_macosx_version=`echo $macosx_version | sed 's|\([^\.]*\)\.\([^\.]*\)|\1\200|'`;;

[1-9][0-9].[1-9][0-9].[0-9])

int_macosx_version=`echo $macosx_version | sed 's|\([^\.]*\)\.\([^\.]*\)\.\([^\.]*\)|\1\20\3|'`;;

[1-9][0-9].[1-9][0-9].[1-9][0-9])

int_macosx_version=`echo $macosx_version | sed 's|\([^\.]*\)\.\([^\.]*\)\.\([^\.]*\)|\1\2\3|'`;;

*)

int_macosx_version=unexpected;;

esac]

test $int_macosx_version != unexpected || {

AC_MSG_ERROR([Unexpected MacOSX version ($macosx_version) returned by 'sw_vers -productVersion'; this configure script probably needs to be updated])

}

AC_TRY_COMPILE([

#if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ > $int_macosx_version

#error Compiling for a newer MacOSX version...

#endif

], [;],

[],

[AC_MSG_ERROR([

You are natively building Erlang/OTP for a later version of MacOSX

than current version ($macosx_version). You either need to

cross-build Erlang/OTP, or set the environment variable

MACOSX_DEPLOYMENT_TARGET to $macosx_version (or a lower version).

])])

;;

*)

;;

esac

fi