--- src/readstat/stata/readstat_dta_read.c	2025-05-30 20:55:26.000000000 +0800
+++ src/readstat/stata/readstat_dta_read.c	2025-06-03 08:15:20.000000000 +0800
@@ -1,6 +1,4 @@
 
-#define _XOPEN_SOURCE 700 /* for strnlen */
-
 #include <stdlib.h>
 #include <math.h>
 #include <time.h>