diff -urN a/extensions/lt-ext-ldml-u.c b/extensions/lt-ext-ldml-u.c
--- a/extensions/lt-ext-ldml-u.c	2021-09-27 12:52:04.000000000 +0800
+++ b/extensions/lt-ext-ldml-u.c	2024-10-31 20:22:27.114856448 +0800
@@ -17,6 +17,7 @@
 #include "lt-stdint.h"
 
 #include <string.h>
+#include <stdlib.h>
 #include <libxml/xpath.h>
 #include "lt-error.h"
 #include "lt-ext-module.h"
diff -urN a/liblangtag/lt-tag.c b/liblangtag/lt-tag.c
--- a/liblangtag/lt-tag.c	2021-09-27 12:52:04.000000000 +0800
+++ b/liblangtag/lt-tag.c	2024-10-31 20:15:14.043548162 +0800
@@ -19,6 +19,7 @@
 #include <ctype.h>
 #include <locale.h>
 #include <string.h>
+#include <stdlib.h>
 #include <libxml/xpath.h>
 #include "lt-config.h"
 #include "lt-database.h"
diff -urN a/liblangtag/lt-xml.c b/liblangtag/lt-xml.c
--- a/liblangtag/lt-xml.c	2021-09-27 12:52:04.000000000 +0800
+++ b/liblangtag/lt-xml.c	2024-10-31 20:14:45.581703360 +0800
@@ -16,6 +16,7 @@
 
 #include <stddef.h>
 #include <string.h>
+#include <stdlib.h>
 #include <sys/stat.h>
 #include <libxml/parser.h>
 #include <libxml/xpath.h>