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-rw-r--r--lib/PublicInbox/Syscall.pm4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/PublicInbox/Syscall.pm b/lib/PublicInbox/Syscall.pm
index 829cfa3c..99af5bf5 100644
--- a/lib/PublicInbox/Syscall.pm
+++ b/lib/PublicInbox/Syscall.pm
@@ -317,6 +317,10 @@ BEGIN {
                 )
         }
         $PACK{CMSG_ALIGN_size} = SIZEOF_size_t;
+        $PACK{SIZEOF_cmsghdr} //= 0;
+        $PACK{TMPL_cmsg_len} //= undef;
+        $PACK{CMSG_DATA_off} //= undef;
+        $PACK{TMPL_msghdr} //= undef;
 }
 
 # SFD_CLOEXEC is arch-dependent, so IN_CLOEXEC may be, too