diff -rc kvm-57-orig/qemu/vl.c kvm-57/qemu/vl.c
*** kvm-57-orig/qemu/vl.c	2007-12-18 16:57:46.000000000 +0100
--- kvm-57/qemu/vl.c	2008-08-26 13:17:57.000000000 +0200
***************
*** 141,147 ****
  #ifdef __sun__
  #define SMBD_COMMAND "/usr/sfw/sbin/smbd"
  #else
! #define SMBD_COMMAND "/usr/sbin/smbd"
  #endif
  
  //#define DEBUG_UNUSED_IOPORT
--- 141,147 ----
  #ifdef __sun__
  #define SMBD_COMMAND "/usr/sfw/sbin/smbd"
  #else
! #define SMBD_COMMAND "smbd"
  #endif
  
  //#define DEBUG_UNUSED_IOPORT
***************
*** 3828,3838 ****
          slirp_init();
      }
  
!     /* XXX: better tmp dir construction */
!     snprintf(smb_dir, sizeof(smb_dir), "/tmp/qemu-smb.%d", getpid());
!     if (mkdir(smb_dir, 0700) < 0) {
!         fprintf(stderr, "qemu: could not create samba server dir '%s'\n", smb_dir);
!         exit(1);
      }
      snprintf(smb_conf, sizeof(smb_conf), "%s/%s", smb_dir, "smb.conf");
  
--- 3828,3840 ----
          slirp_init();
      }
  
!     while (1) {
!         snprintf(smb_dir, sizeof(smb_dir), "/tmp/qemu-smb.%d.%d", getpid(), random());
!         if (mkdir(smb_dir, 0700) == 0) break;
!         if (errno != EEXIST) {
!             fprintf(stderr, "qemu: could not create samba server dir '%s'\n", smb_dir);
!             exit(1);
!         }
      }
      snprintf(smb_conf, sizeof(smb_conf), "%s/%s", smb_dir, "smb.conf");
  
Only in kvm-57/qemu: vl.c~