diff --git a/psb_zdiagsc_bld.f90 b/psb_zdiagsc_bld.f90
new file mode 100644
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--- /dev/null
+++ b/psb_zdiagsc_bld.f90
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+!!$ 
+!!$ 
+!!$                    MD2P4
+!!$    Multilevel Domain Decomposition Parallel Preconditioner Package for PSBLAS
+!!$                      for 
+!!$              Parallel Sparse BLAS  v2.0
+!!$    (C) Copyright 2006 Salvatore Filippone    University of Rome Tor Vergata
+!!$                       Alfredo Buttari        University of Rome Tor Vergata
+!!$                       Daniela di Serafino    Second University of Naples
+!!$                       Pasqua D'Ambra         ICAR-CNR                      
+!!$ 
+!!$  Redistribution and use in source and binary forms, with or without
+!!$  modification, are permitted provided that the following conditions
+!!$  are met:
+!!$    1. Redistributions of source code must retain the above copyright
+!!$       notice, this list of conditions and the following disclaimer.
+!!$    2. Redistributions in binary form must reproduce the above copyright
+!!$       notice, this list of conditions, and the following disclaimer in the
+!!$       documentation and/or other materials provided with the distribution.
+!!$    3. The name of the MD2P4 group or the names of its contributors may
+!!$       not be used to endorse or promote products derived from this
+!!$       software without specific written permission.
+!!$ 
+!!$  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!!$  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!!$  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!!$  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE MD2P4 GROUP OR ITS CONTRIBUTORS
+!!$  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!!$  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!!$  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!!$  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!!$  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!!$  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!!$  POSSIBILITY OF SUCH DAMAGE.
+!!$ 
+!!$  
+subroutine psb_zdiagsc_bld(a,desc_a,p,upd,info)
+
+  use psb_base_mod
+  use psb_prec_type
+  Implicit None
+
+  type(psb_zspmat_type), target           :: a
+  type(psb_desc_type), intent(in)         :: desc_a
+  type(psb_zbaseprc_type),intent(inout)   :: p
+  character, intent(in)                   :: upd
+  integer, intent(out)                    :: info
+
+
+  ! Local scalars
+  Integer      :: err, n_row, n_col,I,j,k,ictxt,&
+       & me,np,mglob,lw, err_act
+  complex(kind(1.d0)),pointer :: gd(:), work(:)
+  integer      :: int_err(5)
+  character    :: iupd
+
+  logical, parameter :: debug=.false.   
+  integer,parameter  :: iroot=0,iout=60,ilout=40
+  character(len=20)   :: name, ch_err
+
+  if(psb_get_errstatus().ne.0) return 
+  info=0
+  err=0
+  call psb_erractionsave(err_act)
+  name = 'psb_diagsc_bld'
+
+  if (debug) write(0,*) 'Entering diagsc_bld'
+  info = 0
+  int_err(1) = 0
+  ictxt  = psb_cd_get_context(desc_a)
+  n_row  = psb_cd_get_local_rows(desc_a)
+  n_col  = psb_cd_get_local_cols(desc_a)
+  mglob  = psb_cd_get_global_rows(desc_a)
+
+  if (debug) write(0,*) 'Preconditioner Blacs_gridinfo'
+  call psb_info(ictxt, me, np)
+
+  if (debug) write(0,*) 'Precond: Diagonal scaling'
+  ! diagonal scaling
+
+  call psb_realloc(n_col,p%d,info)
+  if (info /= 0) then
+    call psb_errpush(4010,name,a_err='psb_realloc')
+    goto 9999
+  end if
+
+  call psb_csrws(p%d,a,info,trans='N')
+  if(info /= 0) then
+    info=4010
+    ch_err='psb_csrws'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  if (debug) write(ilout+me,*) 'VDIAG ',n_row
+  do i=1,n_row
+    if (p%d(i) == zzero) then
+      p%d(i) = zone
+    else
+      p%d(i) = zone/p%d(i)
+    endif
+
+    if (debug) write(ilout+me,*) i,desc_a%loc_to_glob(i), p%d(i)
+!!$    if (p%d(i).lt.0.d0) then
+!!$      write(0,*) me,'Negative RWS? ',i,p%d(i)
+!!$    endif
+  end do
+  if (a%pl(1) /= 0) then
+    allocate(work(n_row),stat=info)
+    if (info /= 0) then
+      info=4000
+      call psb_errpush(info,name)
+      goto 9999
+    end if
+    call  psb_gelp('n',a%pl,p%d,desc_a,info)
+    if(info /= 0) then
+      info=4010
+      ch_err='psb_zgelp'
+      call psb_errpush(info,name,a_err=ch_err)
+      goto 9999
+    end if
+
+    deallocate(work)
+  endif
+
+  if (debug) then
+    allocate(gd(mglob),stat=info)       
+    if (info /= 0) then 
+      call psb_errpush(4010,name,a_err='Allocate')
+      goto 9999      
+    end if
+
+    call  psb_gather(gd, p%d, desc_a, info, iroot=iroot)
+    if(info /= 0) then
+      info=4010
+      ch_err='psb_zgatherm'
+      call psb_errpush(info,name,a_err=ch_err)
+      goto 9999
+    end if
+
+    if (me.eq.iroot) then
+      write(iout+np,*) 'VDIAG CHECK ',mglob
+      do i=1,mglob
+        write(iout+np,*) i,gd(i)
+      enddo
+    endif
+    deallocate(gd)
+  endif
+  if (debug) write(*,*) 'Preconditioner DIAG computed OK'
+
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 continue
+  call psb_erractionrestore(err_act)
+  if (err_act.eq.act_abort) then
+    call psb_error()
+    return
+  end if
+  return
+
+end subroutine psb_zdiagsc_bld
+