tools/docker: add old-env

old-env is based on Ubuntu 16.04 and allows to test
executor build on older distributions.

Fixes #2055

1 files changed, 1 insertions, 1 deletions

diff --git a/executor/common_linux.h b/executor/common_linux.h
index 244707191..68be3eeff 100644
--- a/executor/common_linux.h
+++ b/executor/common_linux.h
@@ -864,7 +864,7 @@ static void netlink_wireguard_setup(void)
 	    .sin6_port = htons(listen_c)};
 	endpoint_c_v6.sin6_addr = in6addr_loopback;
 	const struct in_addr first_half_v4 = {0};
-	const struct in_addr second_half_v4 = {htonl(128 << 24)};
+	const struct in_addr second_half_v4 = {(uint32)htonl(128 << 24)};
 	const struct in6_addr first_half_v6 = {{{0}}};
 	const struct in6_addr second_half_v6 = {{{0x80}}};
 	const uint8 half_cidr = 1;