+if test x"$enable_acl_support" = x"no" -o x"$enable_xattr_support" = x"no" -o x"$enable_iconv" = x"no"; then
+ AC_MSG_CHECKING([whether $CC supports -Wno-unused-parameter])
+ OLD_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS -Wno-unused-parameter"
+ AC_TRY_LINK([#include <stdio.h>], [printf("hello\n");], [rsync_warn_flag=yes], [rsync_warn_flag=no])
+ AC_MSG_RESULT([$rsync_warn_flag])
+ if test x"$rsync_warn_flag" = x"no"; then
+ CFLAGS="$OLD_CFLAGS"
+ fi
+fi
+
+case "$CC" in
+' checker'*|checker*)
+ AC_DEFINE(FORCE_FD_ZERO_MEMSET, 1, [Used to make "checker" understand that FD_ZERO() clears memory.])
+ ;;
+esac
+