diff -aur mqtt_udp-0.4-1/lang/c/configure.in ../build/extbld/third_party/mqtt_udp/core/mqtt_udp-0.4-1/lang/c/configure.in
--- mqtt_udp-0.4-1/lang/c/configure.in	2019-01-15 04:19:17.000000000 +0300
+++ ../build/extbld/third_party/mqtt_udp/core/mqtt_udp-0.4-1/lang/c/configure.in2021-03-06 19:34:59.006236839 +0300
@@ -22,7 +22,7 @@
 AC_TYPE_SSIZE_T
 
 # Checks for library functions.
-AC_FUNC_MALLOC
+#AC_FUNC_MALLOC
 AC_CHECK_FUNCS([memset socket strlcpy])
 
 AC_CONFIG_FILES([Makefile])
