https://git.netfilter.org/libnftnl/commit/?id=accee9a75e0e6678863d092d6a4f4afbadf0eed9

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Wed, 18 May 2022 23:54:03 +0200
Subject: set_elem: missing export symbol

nftnl_set_elem_nlmsg_build_payload() is already available through .map
file and headers, add missing EXPORT_SYMBOL.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
--- a/src/set_elem.c
+++ b/src/set_elem.c
@@ -300,6 +300,7 @@ err:
 	return NULL;
 }
 
+EXPORT_SYMBOL(nftnl_set_elem_nlmsg_build_payload);
 void nftnl_set_elem_nlmsg_build_payload(struct nlmsghdr *nlh,
 				      struct nftnl_set_elem *e)
 {
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