Seems like there's a conflict between configure.ac and   
hw/xfree86/os-support/bus/Pci.h...   
   
On the header there's this:   
   
#elif defined(__i386__) || defined(i386)   
# define ARCH_PCI_INIT ix86PciInit   
# define INCLUDE_XF86_MAP_PCI_MEM   
# define INCLUDE_XF86_NO_DOMAIN   
# if defined(linux)   
#  define ARCH_PCI_OS_INIT linuxPciInit   
# endif   
#elif defined(__mc68000__)   
   
so it tries to use ix86PciInit for FreeBSD (as there's no #if defined for it).  
  
Bug in configure.ac there's:  
  
  i*86)  
        xorg_bus_ix86pci="yes"  
        use_x86_asm="yes"  
        I386_VIDEO=yes  
        case $host_os in  
                *linux*)        DEFAULT_INT10=vm86 ;;  
                *freebsd*)      xorg_bus_ix86pci="no"  
                                AC_DEFINE(USE_DEV_IO) ;;  
                *netbsd*)       xorg_bus_ix86pci="no"  
                                AC_DEFINE(USE_I386_IOPL) ;;  
                *openbsd*)      xorg_bus_ix86pci="no"  
                                AC_DEFINE(USE_I386_IOPL) ;;  
        esac  
        ;;  
  
that disable ix86pci on FreeBSD, thus ix86Pci.c source file is not compiled,  
thus leading to undefined symbol later in the build process. 
 
I'm not sure what is the right way to fix this, if it's wrong the configure or 
the source file, but one of the two should be fixed... 
 
Thanks in advance, 
Diego