--- socat-1.7.3.4/compat.h.orig 2019-04-04 09:59:55.000000000 +0100+++ socat-1.7.3.4/compat.h 2021-01-12 12:41:10.675182890 +0000@@ -695,6 +695,10 @@ # define NETDB_INTERNAL h_NETDB_INTERNAL #endif +#if !defined(NETDB_INTERNAL)+# define NETDB_INTERNAL (-1)+#endif+ #ifndef INET_ADDRSTRLEN # define INET_ADDRSTRLEN sizeof(struct sockaddr_in) #endif