Got 9vx to compile on OSX and added preliminary tap support for Darwin. -npe - vx32 - Local 9vx git repository for patches.
 (HTM) git clone git://r-36.net/vx32
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       ---
 (DIR) commit 0192bda68b2d637ae9b6998b956720b959b63e83
 (DIR) parent f355b3ad7a021ebcf86258d7b3e2b1fc957aee66
 (HTM) Author: npe@jmk <none@none>
       Date:   Wed, 27 Oct 2010 17:20:03 -0700
       
       Got 9vx to compile on OSX and added preliminary tap support for Darwin. -npe
       
       Diffstat:
         M src/9vx/ethertap.c                  |      19 +++++++++++++++++++
         M src/Makefrag                        |       4 ++--
       
       2 files changed, 21 insertions(+), 2 deletions(-)
       ---
 (DIR) diff --git a/src/9vx/ethertap.c b/src/9vx/ethertap.c
       @@ -16,6 +16,7 @@
        #include "etherif.h"
        #include "vether.h"
        
       +#include <sys/socket.h>
        #include <net/if.h>
        #include <sys/ioctl.h>
        
       @@ -67,6 +68,24 @@ opentap(char *dev)
                        return -1;
                return fd;
        }
       +#elif defined(__DARWIN_UNIX03)
       +static int
       +opentap(char *dev)
       +{
       +        int fd;
       +        struct stat s;
       +
       +        iprint("tundev: %s\n", dev);
       +        if((fd = open("/dev/tap0", O_RDWR)) < 0)
       +                return -1;
       +        /* 
       +         *  miserable hack to get the interface up, 
       +         *  feel free to add the ioctls if you're feeling energetic. 
       +         */
       +        system("ifconfig tap0 0.0.0.0 up");
       +
       +        return fd;
       +}
        #endif
        
        static int
 (DIR) diff --git a/src/Makefrag b/src/Makefrag
       @@ -5,8 +5,8 @@ COMMON_CFLAGS = -g -O2 -MD -std=gnu99 -I. -fno-stack-protector $(CFLAGS)
        COMMON_LDFLAGS = -g -L. $(LDFLAGS)
        
        # Host environment compiler options
       -HOST_CC                := $(CC) -fno-inline
       -HOST_LD                := $(LD)
       +HOST_CC                := $(CC) -fno-inline -D_XOPEN_SOURCE -arch i386 -m32
       +HOST_LD                := $(LD) -arch i386
        HOST_AR                := $(AR)
        HOST_LDFLAGS        := $(COMMON_LDFLAGS)
        HOST_CFLAGS        := $(COMMON_CFLAGS)