One of Win64 rules lacked bufferoverflowu.lib.

util/pl/VC-32.pl

diff --git a/util/pl/VC-32.pl b/util/pl/VC-32.pl
index d159f0f..acd2e7b 100644
--- a/util/pl/VC-32.pl
+++ b/util/pl/VC-32.pl
@@ -260,7 +260,9 @@
 		{
 		local($ex)=($target =~ /O_CRYPTO/)?'':' $(L_CRYPTO)';
 		if ($name eq "")
-			{}
+			{
+			$ex.=' bufferoverflowu.lib' if ($FLAVOR =~ /WIN64/);
+			}
 		elsif ($FLAVOR =~ /CE/)
 			{
 			$ex.=' winsock.lib';