From f8ffde6c0c0a9008cd65601f6c9712899106e42c Mon Sep 17 00:00:00 2001
From: "Yann E. MORIN" <yann.morin.1998@free.fr>
Date: Mon, 11 Apr 2016 23:03:48 +0200
Subject: [PATCH] host2ip.c: disable NIS support for toolchains lacking SUN RPC

Some toolchains are missing SUN RPC; this is the case for toolchains
based on uClibc, and some glibc-based toolchains (when SUN RPC headers
were taken out of glibc).

Add a configure check for the required SUN RPC header, and make the code
using SUN RPC conditional on the result.

Also drop the legacy AM_C_PROTOTYPES: it is no longer supported by
autoconf and breaks autoreconf.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
[yann.morin.1998@free.fr: add the ./configure check; do not include
 features.h; do not check specifically for uClibc]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
---
 configure.in | 3 ++-
 host2ip.c    | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/configure.in b/configure.in
index de394cf..889e6ed 100644
--- a/configure.in
+++ b/configure.in
@@ -39,9 +39,10 @@ CU_CHECK_LIB(socket, socket)
 dnl Checks for header files.
 AC_HEADER_STDC
 AC_CHECK_HEADERS(search.h sys/time.h unistd.h)
+AC_CHECK_HEADER([rpcsvc/ypclnt.h],
+                [AC_DEFINE([HAVE_YP],[1],[Define to 1 if you have rpcsvc/ypclnt.h])])
 
 dnl Checks for typedefs, structures, and compiler characteristics.
-AM_C_PROTOTYPES
 AC_C_CONST
 AC_C_BIGENDIAN
 AC_TYPE_UID_T
diff --git a/host2ip.c b/host2ip.c
index b094343..95014cd 100644
--- a/host2ip.c
+++ b/host2ip.c
@@ -3,7 +3,10 @@
 #include <netdb.h>           /* gethostbyname() */
 #include <netinet/in.h>      /* sockaddr_in */
 #include <arpa/inet.h>       /* inet_addr() */
+#ifdef HAVE_YP
 #include <rpcsvc/ypclnt.h>   /* YP */
+#endif
+
 #include <string.h>          /* strlen() added by Akira 12/27/01 */ 
 #include "sysdep.h"
 
@@ -28,6 +31,7 @@ struct in_addr host2ip(char *host)
   else if ((hep = gethostbyname(host))) {
     in = *(struct in_addr *)(hep->h_addr_list[0]);
   }
+#ifdef HAVE_YP
   /* As a last resort, try YP. */
   else {
     static char *domain = 0;  /* YP domain */
@@ -39,5 +43,6 @@ struct in_addr host2ip(char *host)
       in.s_addr = inet_addr(value);
     }
   }
+#endif
   return in;
 } /* host2ip */
-- 
1.9.1