File radvd-configure.patch of Package radvd

diff --git a/configure.ac b/configure.ac
index 3ab6667..afbdc5a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -44,7 +44,9 @@ you must specifiy it with --target on the configure command line])
 esac
 
 dnl Determine CC and preset CFLAGS
-AC_PROG_CC
+AC_PROG_CC_STDC
+AC_USE_SYSTEM_EXTENSIONS
+AC_SYS_LARGEFILE
 
 dnl Determine of netlink is available
 AC_MSG_CHECKING(netlink)
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