https://github.com/simsong/tcpflow/issues/238
https://github.com/simsong/tcpflow/commit/a0697509c4657e2fd94f941e43a2d4c86ddf9fe4

From: "Simson L. Garfinkel" <simsong@acm.org>
Date: Thu, 11 Mar 2021 19:30:54 -0500
Subject: [PATCH] Update datalink.cpp (#239)

per https://salsa.debian.org/debian/tcpflow/-/blob/master/debian/patches/fix-werror-format-security.patch
Closes https://github.com/simsong/tcpflow/issues/238
--- a/src/datalink.cpp
+++ b/src/datalink.cpp
@@ -171,10 +171,7 @@ void dl_ethernet(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
             break;
         }
     } catch( std::logic_error e){
-        std::string s(std::string("warning: caught std::logic_error ")
-                      + e.what()
-                      + std::string(" in packet"));
-        DEBUG(6)(s.c_str());
+        DEBUG(6)("Warning: caught std::logic_error %s in packet",e.what());
     }
 }