fix a false failure with APR_CHECK_GETNAMEINFO_IPV4_MAPPED on z/OS

- NI_MAXHOST is not defined, so provide fall-back logic
  (we could just skip NI_MAXHOST altogether, but showing the
  fallback will remind folks of why we can't just use NI_MAXHOST)
- htonl is a macro in arpa/inet.h, so include that header so that
  the link is successful


git-svn-id: http://svn.apache.org/repos/asf/apr/apr/branches/APR_0_9_BRANCH@64844 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 7 insertions, 0 deletions

diff --git a/build/apr_network.m4 b/build/apr_network.m4
index f37e25c0d..f227bbefb 100644
--- a/build/apr_network.m4
+++ b/build/apr_network.m4
@@ -164,11 +164,18 @@ AC_DEFUN(APR_CHECK_GETNAMEINFO_IPV4_MAPPED,[
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
 
 void main(void) {
     struct sockaddr_in6 sa = {0};
     struct in_addr ipv4;
+#if defined(NI_MAXHOST)
     char hbuf[NI_MAXHOST];
+#else
+    char hbuf[256];
+#endif
     unsigned int *addr32;
     int error;