Fix portability problems with glibc 2.0, as reported in #449157.
diff --git a/Modules/getnameinfo.c b/Modules/getnameinfo.c
index 475b531..4827bc6 100644
--- a/Modules/getnameinfo.c
+++ b/Modules/getnameinfo.c
@@ -81,6 +81,10 @@
#define ENI_FAMILY 5
#define ENI_SALEN 6
+/* forward declaration to make gcc happy */
+int getnameinfo Py_PROTO((const struct sockaddr *, size_t, char *, size_t,
+ char *, size_t, int));
+
int
getnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
const struct sockaddr *sa;