AC_CHECK_SIZEOF(unsigned int)
AC_CHECK_SIZEOF(unsigned long int)
AC_CHECK_SIZEOF(unsigned long long int)
AC_CHECK_SIZEOF(unsigned int)
AC_CHECK_SIZEOF(unsigned long int)
AC_CHECK_SIZEOF(unsigned long long int)
AC_CHECK_FUNC([sync_file_range],
[AC_DEFINE([HAVE_SYNC_FILE_RANGE], [sync_file_range(2) is not supported], [sync_file_range(2) is supported])],
[])
AC_CHECK_FUNC([sync_file_range],
[AC_DEFINE([HAVE_SYNC_FILE_RANGE], [sync_file_range(2) is not supported], [sync_file_range(2) is supported])],
[])