Fix gethostbyaddr_r() detection for FreeBSD. (closes: #454)

	Patch from David Wood <david@wood2.org.uk>

diff --git a/configure.in b/configure.in
index 30d5f11..d776f94 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -845,9 +845,20 @@ gethostbyaddrrstyle=""
 AC_MSG_CHECKING([gethostbyaddr_r() syntax])
 case "$host" in
 *-freebsd*)
-       AC_DEFINE(GETHOSTBYADDRRSTYLE, BSDSTYLE)
-       gethostbyaddrrstyle=BSD
-       AC_MSG_WARN([FreeBSD overridden to BSD-style])
+dnl With FreeBSD, check if there's a prototype for gethostbyaddr_r.
+dnl Some versions (FreeBSD 5.1?) have a symbol but no prototype - so we
+dnl override this test to BSDSTYLE. FreeBSD 6.2 and up have proper GNU
+dnl style support.
+       AC_CHECK_DECLS([gethostbyaddr_r], [], [
+               AC_DEFINE(GETHOSTBYADDRRSTYLE, BSDSTYLE,
+                       [style of gethostbyaddr_r functions ])
+               gethostbyaddrrstyle=BSD
+               AC_MSG_WARN([FreeBSD overridden to BSD-style])
+       ], [
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+])
        ;;
 esac
 if test "x$gethostbyaddrrstyle" = "x"; then