diff --git a/psb_zprecbld.f90 b/psb_zprecbld.f90
new file mode 100644
index 00000000..2a51df83
--- /dev/null
+++ b/psb_zprecbld.f90
@@ -0,0 +1,169 @@
+!!$ 
+!!$ 
+!!$                    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_zprecbld(a,desc_a,p,info,upd)
+
+  use psb_base_mod
+  use psb_prec_type
+  use psb_prec_mod
+  Implicit None
+
+  type(psb_zspmat_type), target              :: a
+  type(psb_desc_type), intent(in), target    :: desc_a
+  type(psb_zprec_type),intent(inout)         :: p
+  integer, intent(out)                       :: info
+  character, intent(in), optional            :: upd
+
+
+  ! Local scalars
+  Integer      :: err,i,j,k,ictxt, me,np,lw, err_act
+  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_precbld'
+
+  if (debug) write(0,*) 'Entering precbld',P%prec,desc_a%matrix_data(:)
+  info = 0
+  int_err(1) = 0
+  ictxt = psb_cd_get_context(desc_a)
+
+  if (debug) write(0,*) 'Preconditioner psb_info'
+  call psb_info(ictxt, me, np)
+
+  if (present(upd)) then 
+    if (debug) write(0,*) 'UPD ', upd
+    if ((upd.eq.'F').or.(upd.eq.'T')) then
+      iupd=upd
+    else
+      iupd='F'
+    endif
+  else
+    iupd='F'
+  endif
+
+  if (.not.allocated(p%baseprecv)) then 
+    !! Error 1: should call precset
+      info=4010
+      ch_err='unallocated bpv'
+      call psb_errpush(info,name,a_err=ch_err)
+      goto 9999
+  end if
+  !
+  ! Should add check to ensure all procs have the same... 
+  !
+  ! ALso should define symbolic names for the preconditioners. 
+  !
+  if (size(p%baseprecv) >= 1) then 
+    call init_baseprc_av(p%baseprecv(1),info)
+    if (info /= 0) then 
+      info=4010
+      ch_err='allocate'
+      call psb_errpush(info,name,a_err=ch_err)
+      goto 9999
+    endif
+    
+    call psb_baseprc_bld(a,desc_a,p%baseprecv(1),info,iupd)
+
+  else
+      info=4010
+      ch_err='size bpv'
+      call psb_errpush(info,name,a_err=ch_err)
+      goto 9999
+
+  endif
+
+  if (size(p%baseprecv) > 1) then
+
+    do i=2, size(p%baseprecv)
+      call init_baseprc_av(p%baseprecv(i),info)
+      if (info /= 0) then 
+        info=4010
+        ch_err='allocate'
+        call psb_errpush(info,name,a_err=ch_err)
+        goto 9999
+      endif
+
+      call psb_mlprc_bld(p%baseprecv(i-1)%base_a,p%baseprecv(i-1)%base_desc,&
+           & p%baseprecv(i),info)
+      if (info /= 0) then 
+        info=4010
+        call psb_errpush(info,name)
+        goto 9999
+      endif
+      if (debug) then 
+        write(0,*) 'Return from ',i-1,' call to mlprcbld ',info
+      endif
+
+    end do
+
+  endif
+
+  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
+
+contains
+
+  subroutine init_baseprc_av(p,info)
+    type(psb_zbaseprc_type), intent(inout) :: p
+    integer                                :: info
+    if (allocated(p%av)) then 
+      ! Have not decided what to do yet
+    end if
+    allocate(p%av(max_avsz),stat=info)
+!!$    if (info /= 0) return
+    do k=1,size(p%av)
+      call psb_nullify_sp(p%av(k))
+    end do
+  end subroutine init_baseprc_av
+
+end subroutine psb_zprecbld
+