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diff --git a/contrib/libpcap/thread-local.h b/contrib/libpcap/thread-local.h
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+/*
+ * Copyright (c) 1994, 1995, 1996
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the Computer Systems
+ *	Engineering Group at Lawrence Berkeley Laboratory.
+ * 4. Neither the name of the University nor of the Laboratory may be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef thread_local_h
+#define	thread_local_h
+
+/*
+ * This defines thread_local to specify thread-local storage, if it
+ * is not already defined.
+ *
+ * C11, if __STDC_NO_THREADS__ is not defined to be 1, defines
+ * _Thread_local to indicate thread-local storage.  (You can also
+ * include <threads.h> to so define it, but we don't use any of
+ * the other stuff there.)
+ *
+ * Otherwise, we define it ourselves, based on the compiler.
+ *
+ * This is taken from https://stackoverflow.com/a/18298965/16139739.
+ */
+#ifndef thread_local
+  #if __STDC_VERSION__ >= 201112 && !defined __STDC_NO_THREADS__
+    #define thread_local _Thread_local
+  #elif defined __TINYC__
+    #define thread_local
+    #warning "Some libpcap calls will not be thread-safe."
+  #elif defined _WIN32 && ( \
+         defined _MSC_VER || \
+         defined __ICL || \
+         defined __DMC__ || \
+         defined __BORLANDC__ )
+    #define thread_local __declspec(thread)
+  /* note that ICC (linux) and Clang are covered by __GNUC__ */
+  #elif defined __GNUC__ || \
+         defined __SUNPRO_C || \
+         defined __xlC__
+    #define thread_local __thread
+  #else
+    #error "Cannot define thread_local"
+  #endif
+#endif
+
+#endif