1 files changed, 25 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index 6294eb06..4cad8282 100755
--- a/configure.ac
+++ b/configure.ac
@@ -494,6 +494,31 @@ AC_SUBST(RT_METHOD)
 AC_SUBST(KERNEL_METHOD)
 AC_SUBST(OTHER_METHOD)
 
+dnl ------------------------------------
+dnl check for broken CMSG_FIRSTHDR macro
+dnl ------------------------------------
+AC_TRY_RUN([
+#ifdef SUNOS_5
+#define _XPG4_2
+#define __EXTENSIONS__
+#endif
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+main()
+{
+  struct msghdr msg;
+  char buf[4];
+
+  msg.msg_control = buf;
+  msg.msg_controllen = 0;
+
+  if (CMSG_FIRSTHDR(&msg) != NULL)
+    exit(0);
+  exit (1);
+}],[AC_DEFINE(HAVE_BROKEN_CMSG_FIRSTHDR,,Broken CMSG_FIRSTHDR)])
+
 dnl ------------------------------
 dnl check kernel route read method
 dnl ------------------------------