OpenBSD has its own version of libpcap.

Index: t/17-lib_version.t
--- t/17-lib_version.t.orig
+++ t/17-lib_version.t
@@ -13,6 +13,9 @@ diag($version);
 if ($^O eq 'MSWin32' or $^O eq 'cygwin') {
     like( $version, '/^WinPcap version \d\.\d+/', " - checking version string ($version)" );
 }
+elsif ($^O eq 'openbsd') {
+    like( $version, '/^OpenBSD libpcap$/', " - checking version string ($version)" );
+}
 else {
     like( $version,
             '/^libpcap version (?:\d+\.\d+(?:\.\d+|[^\d.\s]+)?|unknown \(pre 0\.8\))/',