diff --git a/acinclude.m4 b/acinclude.m4
index b621d6afb..ce09b60d1 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -422,45 +422,106 @@ AC_DEFUN([CURL_CHECK_FUNC_GETNAMEINFO], [
 ]) # AC_DEFUN
 
 
+dnl TYPE_SOCKADDR_STORAGE
+dnl -------------------------------------------------
+dnl Check for struct sockaddr_storage. Most IPv6-enabled 
+dnl hosts have it, but AIX 4.3 is one known exception.
+
+AC_DEFUN([TYPE_SOCKADDR_STORAGE],
+[
+   AC_CHECK_TYPE([struct sockaddr_storage],
+        AC_DEFINE(HAVE_STRUCT_SOCKADDR_STORAGE, 1,
+                  [if struct sockaddr_storage is defined]), ,
+   [
+#undef inline
+#ifdef HAVE_WINDOWS_H
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#ifdef HAVE_WINSOCK2_H
+#include <winsock2.h>
+#endif
+#else
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+#endif
+   ])
+])
+
+
 dnl CURL_CHECK_NI_WITHSCOPEID
 dnl -------------------------------------------------
 dnl Check for working NI_WITHSCOPEID in getnameinfo()
 
 AC_DEFUN([CURL_CHECK_NI_WITHSCOPEID], [
+  AC_REQUIRE([CURL_CHECK_FUNC_GETNAMEINFO])dnl
+  AC_REQUIRE([TYPE_SOCKADDR_STORAGE])dnl
+  AC_CHECK_HEADERS(stdio.h sys/types.h sys/socket.h \
+                   netdb.h netinet/in.h arpa/inet.h)
+  #
   AC_CACHE_CHECK([for working NI_WITHSCOPEID], 
     [ac_cv_working_ni_withscopeid], [
     AC_RUN_IFELSE([
       AC_LANG_PROGRAM([
+#ifdef HAVE_STDIO_H
 #include <stdio.h>
+#endif
+#ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
+#endif
+#ifdef HAVE_NETDB_H
 #include <netdb.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
       ],[
-#ifdef NI_WITHSCOPEID
-        struct sockaddr_storage ss;
-        int sslen = sizeof(ss);
+#if defined(NI_WITHSCOPEID) && defined(HAVE_GETNAMEINFO)
+#ifdef HAVE_STRUCT_SOCKADDR_STORAGE
+        struct sockaddr_storage sa;
+#else
+        unsigned char sa[256];
+#endif
+        char hostbuf[NI_MAXHOST];
         int rc;
-        char hbuf[NI_MAXHOST];
+        GETNAMEINFO_TYPE_ARG2 salen = (GETNAMEINFO_TYPE_ARG2)sizeof(sa);
+        GETNAMEINFO_TYPE_ARG46 hostlen = (GETNAMEINFO_TYPE_ARG46)sizeof(hostbuf);
+        GETNAMEINFO_TYPE_ARG7 flags = NI_NUMERICHOST | NI_NUMERICSERV | NI_WITHSCOPEID;
         int fd = socket(AF_INET6, SOCK_STREAM, 0);
         if(fd < 0) {
           perror("socket()");
           return 1; /* Error creating socket */
         }
-        rc = getsockname(fd, (struct sockaddr *)&ss, &sslen);
+        rc = getsockname(fd, (GETNAMEINFO_TYPE_ARG1)&sa, &salen);
         if(rc) {
           perror("getsockname()");
           return 2; /* Error retrieving socket name */
         }
-        rc = getnameinfo((struct sockaddr *)&ss, sslen, hbuf, sizeof(hbuf),
-               NULL, 0,
-               NI_NUMERICHOST | NI_NUMERICSERV | NI_WITHSCOPEID);
+        rc = getnameinfo((GETNAMEINFO_TYPE_ARG1)&sa, salen, hostbuf, hostlen, NULL, 0, flags);
         if(rc) {
           printf("rc = %s\n", gai_strerror(rc));
           return 3; /* Error translating socket address */
         }
         return 0; /* Ok, NI_WITHSCOPEID works */
 #else
-        return 4; /* Error, NI_WITHSCOPEID not defined */
+        return 4; /* Error, NI_WITHSCOPEID not defined or no getnameinfo() */
 #endif
       ]) # AC_LANG_PROGRAM
     ],[
@@ -474,7 +535,6 @@ AC_DEFUN([CURL_CHECK_NI_WITHSCOPEID], [
       # NI_WITHSCOPEID will work if we are able to compile it.
       AC_COMPILE_IFELSE([
         AC_LANG_PROGRAM([
-#include <stdio.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netdb.h>
@@ -637,43 +697,6 @@ dnl end of non-blocking try-compile test
 ])
 
 
-dnl TYPE_SOCKADDR_STORAGE
-dnl -------------------------------------------------
-dnl Check for struct sockaddr_storage. Most IPv6-enabled hosts have it, but
-dnl AIX 4.3 is one known exception.
-AC_DEFUN([TYPE_SOCKADDR_STORAGE],
-[
-   AC_CHECK_TYPE([struct sockaddr_storage],
-        AC_DEFINE(HAVE_STRUCT_SOCKADDR_STORAGE, 1,
-                  [if struct sockaddr_storage is defined]), ,
-   [
-#undef inline
-#ifdef HAVE_WINDOWS_H
-#ifndef WIN32_LEAN_AND_MEAN
-#define WIN32_LEAN_AND_MEAN
-#endif
-#include <windows.h>
-#ifdef HAVE_WINSOCK2_H
-#include <winsock2.h>
-#endif
-#else
-#ifdef HAVE_SYS_TYPES_H
-#include <sys/types.h>
-#endif
-#ifdef HAVE_SYS_SOCKET_H
-#include <sys/socket.h>
-#endif
-#ifdef HAVE_NETINET_IN_H
-#include <netinet/in.h>
-#endif
-#ifdef HAVE_ARPA_INET_H
-#include <arpa/inet.h>
-#endif
-#endif
-   ])
-])
-
-
 dnl TYPE_IN_ADDR_T
 dnl -------------------------------------------------
 dnl Check for in_addr_t: it is used to receive the return code of inet_addr()
diff --git a/ares/acinclude.m4 b/ares/acinclude.m4
index dba89de68..e3f7583f6 100644
--- a/ares/acinclude.m4
+++ b/ares/acinclude.m4
@@ -401,45 +401,106 @@ AC_DEFUN([CURL_CHECK_FUNC_GETNAMEINFO], [
 ]) # AC_DEFUN
 
 
+dnl TYPE_SOCKADDR_STORAGE
+dnl -------------------------------------------------
+dnl Check for struct sockaddr_storage. Most IPv6-enabled 
+dnl hosts have it, but AIX 4.3 is one known exception.
+
+AC_DEFUN([TYPE_SOCKADDR_STORAGE],
+[
+   AC_CHECK_TYPE([struct sockaddr_storage],
+        AC_DEFINE(HAVE_STRUCT_SOCKADDR_STORAGE, 1,
+                  [if struct sockaddr_storage is defined]), ,
+   [
+#undef inline
+#ifdef HAVE_WINDOWS_H
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#ifdef HAVE_WINSOCK2_H
+#include <winsock2.h>
+#endif
+#else
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+#endif
+   ])
+])
+
+
 dnl CURL_CHECK_NI_WITHSCOPEID
 dnl -------------------------------------------------
 dnl Check for working NI_WITHSCOPEID in getnameinfo()
 
 AC_DEFUN([CURL_CHECK_NI_WITHSCOPEID], [
+  AC_REQUIRE([CURL_CHECK_FUNC_GETNAMEINFO])dnl
+  AC_REQUIRE([TYPE_SOCKADDR_STORAGE])dnl
+  AC_CHECK_HEADERS(stdio.h sys/types.h sys/socket.h \
+                   netdb.h netinet/in.h arpa/inet.h)
+  #
   AC_CACHE_CHECK([for working NI_WITHSCOPEID], 
     [ac_cv_working_ni_withscopeid], [
     AC_RUN_IFELSE([
       AC_LANG_PROGRAM([
+#ifdef HAVE_STDIO_H
 #include <stdio.h>
+#endif
+#ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
+#endif
+#ifdef HAVE_NETDB_H
 #include <netdb.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
       ],[
-#ifdef NI_WITHSCOPEID
-        struct sockaddr_storage ss;
-        int sslen = sizeof(ss);
+#if defined(NI_WITHSCOPEID) && defined(HAVE_GETNAMEINFO)
+#ifdef HAVE_STRUCT_SOCKADDR_STORAGE
+        struct sockaddr_storage sa;
+#else
+        unsigned char sa[256];
+#endif
+        char hostbuf[NI_MAXHOST];
         int rc;
-        char hbuf[NI_MAXHOST];
+        GETNAMEINFO_TYPE_ARG2 salen = (GETNAMEINFO_TYPE_ARG2)sizeof(sa);
+        GETNAMEINFO_TYPE_ARG46 hostlen = (GETNAMEINFO_TYPE_ARG46)sizeof(hostbuf);
+        GETNAMEINFO_TYPE_ARG7 flags = NI_NUMERICHOST | NI_NUMERICSERV | NI_WITHSCOPEID;
         int fd = socket(AF_INET6, SOCK_STREAM, 0);
         if(fd < 0) {
           perror("socket()");
           return 1; /* Error creating socket */
         }
-        rc = getsockname(fd, (struct sockaddr *)&ss, &sslen);
+        rc = getsockname(fd, (GETNAMEINFO_TYPE_ARG1)&sa, &salen);
         if(rc) {
           perror("getsockname()");
           return 2; /* Error retrieving socket name */
         }
-        rc = getnameinfo((struct sockaddr *)&ss, sslen, hbuf, sizeof(hbuf),
-               NULL, 0,
-               NI_NUMERICHOST | NI_NUMERICSERV | NI_WITHSCOPEID);
+        rc = getnameinfo((GETNAMEINFO_TYPE_ARG1)&sa, salen, hostbuf, hostlen, NULL, 0, flags);
         if(rc) {
           printf("rc = %s\n", gai_strerror(rc));
           return 3; /* Error translating socket address */
         }
         return 0; /* Ok, NI_WITHSCOPEID works */
 #else
-        return 4; /* Error, NI_WITHSCOPEID not defined */
+        return 4; /* Error, NI_WITHSCOPEID not defined or no getnameinfo() */
 #endif
       ]) # AC_LANG_PROGRAM
     ],[
@@ -453,7 +514,6 @@ AC_DEFUN([CURL_CHECK_NI_WITHSCOPEID], [
       # NI_WITHSCOPEID will work if we are able to compile it.
       AC_COMPILE_IFELSE([
         AC_LANG_PROGRAM([
-#include <stdio.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netdb.h>
diff --git a/configure.ac b/configure.ac
index 54395de01..ccee1c8bd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -537,10 +537,6 @@ main()
 
 if test "$ipv6" = "yes"; then
   curl_ipv6_msg="enabled"
-
-  CURL_CHECK_WORKING_GETADDRINFO
-
-  CURL_CHECK_NI_WITHSCOPEID
 fi
 
 dnl **********************************************************************
@@ -1689,6 +1685,11 @@ dnl Check if the getnameinfo function is available
 dnl and get the types of five of its arguments.
 CURL_CHECK_FUNC_GETNAMEINFO
 
+if test "$ipv6" = "yes"; then
+  CURL_CHECK_WORKING_GETADDRINFO
+  CURL_CHECK_NI_WITHSCOPEID
+fi
+
 AC_MSG_CHECKING([if we are Mac OS X (to disable poll)])
 disable_poll=no
 case $host in