- AC_CACHE_CHECK([for gai_strerror (possibly via ws2tcpip.h)],
- gl_cv_func_gai_strerror, [
- AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+ AC_CHECK_DECLS([gai_strerror], [], [], [[
+#include <sys/types.h>
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+#ifdef HAVE_WS2TCPIP_H
+#include <ws2tcpip.h>
+#endif
+#include <stddef.h>
+]])
+ if test $ac_cv_have_decl_gai_strerror = yes; then
+ AC_CHECK_DECLS([gai_strerrorA], [], [], [[
+#include <sys/types.h>
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+#ifdef HAVE_WS2TCPIP_H
+#include <ws2tcpip.h>
+#endif
+#include <stddef.h>
+]])
+ dnl check for correct signature
+ AC_CACHE_CHECK([for gai_strerror with POSIX signature],
+ [gl_cv_func_gai_strerror_posix_signature], [
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[