Index: libcfa/configure
===================================================================
--- libcfa/configure	(revision c680a4ba5e93338ec036f1c5135c217e61c20ac1)
+++ libcfa/configure	(revision 08a994e717c46ee688776bb6c7c1bff9109eb2c7)
@@ -16962,4 +16962,16 @@
 done
 
+for ac_func in preadv2 pwritev2
+do :
+  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
+if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+done
+
 
 ac_config_files="$ac_config_files Makefile src/Makefile prelude/Makefile"