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AC_DEFUN([DETECT_BYTEORDER],
[
AC_REQUIRE([AC_C_BIGENDIAN])
AC_LANG_PUSH([C++])
AC_CACHE_CHECK([for htonll], [ac_cv_have_htonll],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[#include <sys/types.h>
#include <netinet/in.h>
#include <inttypes.h>
], [ return htonll(0) ])],
[ ac_cv_have_htonll=yes ],
[ ac_cv_have_htonll=no ])
])
AC_LANG_POP()
AS_IF([test "x$ac_cv_have_htonll" = "xyes"],[
AC_DEFINE([HAVE_HTONLL], [1], [Have ntohll])])
AM_CONDITIONAL([BUILD_BYTEORDER],[test "x$ac_cv_have_htonll" = "xno"])
])
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