Patches for support FreeBSD

1. Fix search if_tun.h:

--- CMakeLists.txt.orig 2026-03-23 08:45:44 UTC
+++ CMakeLists.txt
@@ -252,7 +252,7 @@ if(ENABLE_TUNTAP)

     elseif(CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
         include(CheckIncludeFile)
-        cm_check_include("net/if_tun.h" HAVE_NET_IF_TUN_H)
+        cm_check_include("net/if.h;net/if_tun.h" HAVE_NET_IF_TUN_H)
         if(HAVE_NET_IF_TUN_H)
             add_definitions(-DHAVE_TUNTAP=1)
         else()

--- Macros.cmake.orig   2026-03-23 08:45:44 UTC
+++ Macros.cmake
@@ -1,4 +1,4 @@
-include(CheckIncludeFile)
+include(CheckIncludeFiles)
 include(CheckFunctionExists)
 include(CheckLibraryExists)
 include(CheckTypeSize)
@@ -30,7 +30,7 @@ macro(cm_check_include include var)
 endmacro()

 macro(cm_check_include include var)
-    check_include_file(${include} ${var})
+    check_include_files("${include}" ${var})
     if(${var})
         set(defines ${defines} "#cmakedefine ${var}\n\n")
     else()

2. Fix build error:

--- src/dpipe.c.orig    2026-03-23 08:45:44 UTC
+++ src/dpipe.c
@@ -201,7 +201,11 @@ int main(int argc, char *argv[])

        if (daemonize != 0)
                daemon(0,0);
+#ifdef VDE_FREEBSD
+       else if (setpgrp(0,getpid()) == -1) {
+#else
        else if (setpgrp() == -1) {
+#endif
                fprintf(stderr,"Err: cannot create pgrp\n");
                perror("setpgrp");
                exit(1);

3. Fix build if libpcap installed from ports:

--- src/vde_pcapplug.c.orig     2026-03-23 08:45:44 UTC
+++ src/vde_pcapplug.c
@@ -32,7 +32,6 @@
 #include <libgen.h>
 #define _GNU_SOURCE
 #include <getopt.h>
-#include <pcap.h>
 #include <limits.h>

 #include <config.h>
@@ -41,8 +40,11 @@
 #include <libvdeplug.h>

 #ifdef VDE_FREEBSD
+#include <net/bpf.h>
 #include <sys/socket.h>
 #endif
+
+#include <pcap.h>

 #if defined(VDE_DARWIN) || defined(VDE_FREEBSD)
 #      if defined HAVE_SYSLIMITS_H

4. Fix build error:

--- src/vde_vxlan/vxlan.c.orig  2026-03-23 08:45:44 UTC
+++ src/vde_vxlan/vxlan.c
@@ -24,6 +24,7 @@

 #include <netinet/in.h>
 #include <sys/un.h>
+#include <sys/socket.h>

 #include "vxlan_hash.h"
 #include "log.h"

Start with the FreeBSD-specific sections in CMakeLists.txt, Macros.cmake, src/dpipe.c, src/vde_pcapplug.c, and src/vde_vxlan/vxlan.c. Review the proposed changes and build the project with ENABLE_TUNTAP and libpcap on FreeBSD, then verify that the build completes and the affected tools can be configured.