diff --git a/lib/irs/include/irs/netdb.h.in b/lib/irs/include/irs/netdb.h.in
index 427fef8..74069b5 100644
--- a/lib/irs/include/irs/netdb.h.in
+++ b/lib/irs/include/irs/netdb.h.in
@@ -151,6 +151,100 @@ struct addrinfo {
 #define	NI_DGRAM	0x00000010
 
 /*
+ * Define to map into irs_ namespace.
+ */
+
+#define IRS_NAMESPACE
+
+#ifdef IRS_NAMESPACE
+
+/*
+ * Use our versions not the ones from the C library.
+ */
+
+#ifdef getnameinfo
+#undef getnameinfo
+#endif
+#define getnameinfo irs_getnameinfo
+
+#ifdef getaddrinfo
+#undef getaddrinfo
+#endif
+#define getaddrinfo irs_getaddrinfo
+
+#ifdef freeaddrinfo
+#undef freeaddrinfo
+#endif
+#define freeaddrinfo irs_freeaddrinfo
+
+#ifdef gai_strerror
+#undef gai_strerror
+#endif
+#define gai_strerror irs_gai_strerror
+
+#endif
+
+extern int getaddrinfo (const char *name,
+			const char *service,
+			const struct addrinfo *req,
+			struct addrinfo **pai);
+extern int getnameinfo (const struct sockaddr *sa,
+			socklen_t salen, char *host,
+			socklen_t hostlen, char *serv,
+			socklen_t servlen, int flags);
+extern void freeaddrinfo (struct addrinfo *ai);
+extern const char *gai_strerror (int ecode);
+
+/*
+ * Define to map into irs_ namespace.
+ */
+
+#define IRS_NAMESPACE
+
+#ifdef IRS_NAMESPACE
+
+/*
+ * Use our versions not the ones from the C library.
+ */
+
+#ifdef getnameinfo
+#undef getnameinfo
+#endif
+#define getnameinfo irs_getnameinfo
+
+#ifdef getaddrinfo
+#undef getaddrinfo
+#endif
+#define getaddrinfo irs_getaddrinfo
+
+#ifdef freeaddrinfo
+#undef freeaddrinfo
+#endif
+#define freeaddrinfo irs_freeaddrinfo
+
+#ifdef gai_strerror
+#undef gai_strerror
+#endif
+#define gai_strerror irs_gai_strerror
+
+int
+getaddrinfo(const char *hostname, const char *servname,
+	    const struct addrinfo *hints, struct addrinfo **res);
+
+int
+getnameinfo(const struct sockaddr *sa, IRS_GETNAMEINFO_SOCKLEN_T salen,
+	    char *host, IRS_GETNAMEINFO_BUFLEN_T hostlen,
+	    char *serv, IRS_GETNAMEINFO_BUFLEN_T servlen,
+	    IRS_GETNAMEINFO_FLAGS_T flags);
+
+void freeaddrinfo (struct addrinfo *ai);
+
+IRS_GAISTRERROR_RETURN_T
+gai_strerror(int ecode);
+
+#endif
+
+/*
  * Tell Emacs to use C mode on this file.
  * Local variables:
  * mode: c