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diff --git a/freebsd/contrib/libpcap/ftmacros.h b/freebsd/contrib/libpcap/ftmacros.h
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+++ b/freebsd/contrib/libpcap/ftmacros.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 ftmacros_h
+#define	ftmacros_h
+
+/*
+ * Define some feature test macros to make sure that everything we want
+ * to be declared gets declared.
+ *
+ * On some UN*Xes we need to force strtok_r() to be declared.
+ * We do *NOT* want to define _POSIX_C_SOURCE, as that tends
+ * to make non-POSIX APIs that we use unavailable.
+ * XXX - is there no portable way to say "please pollute the
+ * namespace to the maximum extent possible"?
+ */
+#if defined(sun) || defined(__sun)
+  #define __EXTENSIONS__
+
+  /*
+   * We also need to define _XPG4_2 in order to get
+   * the Single UNIX Specification version of
+   * recvmsg().
+   */
+  #define _XPG4_2
+#elif defined(_hpux) || defined(hpux) || defined(__hpux)
+  #define _REENTRANT
+
+  /*
+   * We need this to get the versions of socket functions that
+   * use socklen_t.  Define it only if it's not already defined,
+   * so we don't get redefiniton warnings.
+   */
+  #ifndef _XOPEN_SOURCE_EXTENDED
+    #define _XOPEN_SOURCE_EXTENDED
+  #endif
+
+  /*
+   * XXX - the list of PA-RISC options for GCC makes it sound as if
+   * building code that uses a particular vintage of UNIX API/ABI
+   * is complicated:
+   *
+   *    https://gcc.gnu.org/onlinedocs/gcc/HPPA-Options.html
+   *
+   * See the description of the -munix flag.
+   *
+   * We probably want libpcap to work with programs built for any
+   * UN*X standard.  I'm not sure whether that's possible and, if
+   * it is, what sort of stuff it'd have to do.
+   *
+   * It might also be a requirement that we build with a special
+   * flag to allow the library to be used with threaded code, at
+   * least with HP's C compiler; hopefully doing so won't make it
+   * *not* work with *un*-threaded code.
+   */
+#elif defined(__linux__) || defined(linux) || defined(__linux)
+  /*
+   * We can't turn _GNU_SOURCE on because some versions of GNU Libc
+   * will give the GNU version of strerror_r(), which returns a
+   * string pointer and doesn't necessarily fill in the buffer,
+   * rather than the standard version of strerror_r(), which
+   * returns 0 or an errno and always fills in the buffer.  We
+   * require both of the latter behaviors.
+   *
+   * So we try turning everything else on that we can.  This includes
+   * defining _XOPEN_SOURCE as 600, because we want to force crypt()
+   * to be declared on systems that use GNU libc, such as most Linux
+   * distributions.
+   */
+  #define _POSIX_C_SOURCE 200809L
+  #define _XOPEN_SOURCE 600
+
+  /*
+   * We turn on both _DEFAULT_SOURCE and _BSD_SOURCE to try to get
+   * the BSD u_XXX types, such as u_int and u_short, defined.  We
+   * define _DEFAULT_SOURCE first, so that newer versions of GNU libc
+   * don't whine about _BSD_SOURCE being deprecated; we still have
+   * to define _BSD_SOURCE to handle older versions of GNU libc that
+   * don't support _DEFAULT_SOURCE.
+   */
+  #define _DEFAULT_SOURCE
+  #define _BSD_SOURCE
+#endif
+
+#endif