https://rt.cpan.org/Public/Bug/Display.html?id=116784
--- a/Socket6.xs
+++ b/Socket6.xs
@@ -109,7 +109,7 @@ const struct in6_addr in6addr_loopback = IN6ADDR_LOOPB
 #define        PL_sv_undef             sv_undef
 #endif
 
-static int
+static long
 not_here(char *s)
 {
     croak("Socket6::%s not implemented on this architecture", s);