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[bouhadda@yahoo.com]

dear bruno thank you for your replay
i try with this input file according to 
http://cst-www.nrl.navy.mil/lattice/struk.xmol/alphaB.pos with B-I in 6h and 
B-II-in 6h:
#structure et energie total de B
#Definition de la maille elementaire
#**********************************
  acell 1.00000 1.0000000 1.00000 angstrom
rprim 2.45500000 -1.41739000  4.19000000
       .00000000  2.83479000  4.19000000
     -2.45500000 -1.41739000  4.19000000

#Definition des atomes
#*********************
   natom 12
   ntypat 1
   znucl 5
   typat 12*1
   xred  .01000011  -.35100021   .01000011
         .01000077   .01000050  -.35100127
        -.35100127   .01000050   .01000077
        -.01000011   .35100021  -.01000011
        -.01000077  -.01000050   .35100127
         .35100127  -.01000050  -.01000077
         .23000041  -.37100083   .23000041
         .23000145   .22999913  -.37100058
        -.37100058   .22999913   .23000145
        -.23000041   .37100083  -.23000041
        -.23000145  -.22999913   .37100058
         .37100058  -.22999913  -.23000145
   ixc 11
#Definition de la procedure scf
#******************************
   iscf 5
   nstep  100
#Definition de la base d'ondes planes
#************************************
   ecut  20
   kptopt 1
#Structural relaxation
#*********************
   toldfe 1.0d-4
but the output file is :
 Symmetries : space group C2/m (# 12); Bravais mC (1-face-center monocl.)
================================================================================
 Values of the parameters that define the memory need of the present run
   intxc =         0  ionmov =         0    iscf =         5 xclevel =        
 2
  lmnmax =         4   lnmax =         4   mband =        20  mffmem =        
 1
P  mgfft =        40   mkmem =         9 mpssoang=         4     mpw =      
2535
  mqgrid =      3001   natom =        12    nfft =     64000    nkpt =        
 9
  nloalg =         4  nspden =         1 nspinor =         1  nsppol =        
 1
    nsym =         4  n1xccc =      2501  ntypat =         1  occopt =        
 1
================================================================================
P This job should need less than                      25.586 Mbytes of memory.
  Rough estimation (10% accuracy) of disk space for files :
  WF disk file :      6.965 Mbytes ; DEN or POT disk file :      0.490 Mbytes.
================================================================================
but alpha -boron must have 166 space group. iam sure that i have do something 
wrong. thank you