diff --git a/mlprec/impl/level/mld_d_base_onelev_build.f90 b/mlprec/impl/level/mld_d_base_onelev_build.f90
new file mode 100644
index 00000000..9f317db2
--- /dev/null
+++ b/mlprec/impl/level/mld_d_base_onelev_build.f90
@@ -0,0 +1,125 @@
+!!$
+!!$ 
+!!$                           MLD2P4  version 2.0
+!!$  MultiLevel Domain Decomposition Parallel Preconditioners Package
+!!$             based on PSBLAS (Parallel Sparse BLAS version 3.3)
+!!$  
+!!$  (C) Copyright 2008, 2010, 2012, 2015
+!!$
+!!$                      Salvatore Filippone  University of Rome Tor Vergata
+!!$                      Alfredo Buttari      CNRS-IRIT, Toulouse
+!!$                      Pasqua D'Ambra       ICAR-CNR, Naples
+!!$                      Daniela di Serafino  Second University of Naples
+!!$ 
+!!$  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 MLD2P4 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 MLD2P4 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 mld_d_base_onelev_build(lv,info,amold,vmold,imold)
+  use psb_base_mod
+  use mld_d_onelev_mod, mld_protect_name => mld_d_base_onelev_build
+  implicit none
+  class(mld_d_onelev_type), target, intent(inout) :: lv
+  integer(psb_ipk_), intent(out) :: info
+  class(psb_d_base_sparse_mat), intent(in), optional :: amold
+  class(psb_d_base_vect_type), intent(in), optional  :: vmold
+  class(psb_i_base_vect_type), intent(in), optional  :: imold
+  ! Local
+  integer(psb_ipk_)  :: err,i,k, err_act, iszv, newsz, casize
+  integer(psb_ipk_)  :: ictxt, me, np
+  integer(psb_ipk_)  :: ipv(mld_ifpsz_), val
+  integer(psb_ipk_)  :: int_err(5)
+  integer(psb_ipk_)  :: debug_level, debug_unit
+  character(len=20)  :: name, ch_err
+
+  name = 'mld_onelev_build'
+  if (psb_get_errstatus().ne.0) return 
+  info=psb_success_
+  err=0
+  call psb_erractionsave(err_act)
+  debug_unit  = psb_get_debug_unit()
+  debug_level = psb_get_debug_level()
+  if (.not.associated(lv%base_desc)) then
+    info = psb_err_internal_error_
+    call psb_errpush(info,name,&
+         & a_err='Unassociated base DESC')
+    goto 9999
+  end if
+  info = psb_success_
+  int_err(1) = 0
+  ictxt = lv%base_desc%get_ctxt()
+  call psb_info(ictxt,me,np)
+
+  if (.not.allocated(lv%sm)) then 
+    !! Error: should have called mld_dprecinit
+    info=3111
+    call psb_errpush(info,name)
+    goto 9999
+  end if
+  if (.not.allocated(lv%sm%sv)) then 
+    !! Error: should have called mld_dprecinit
+    info=3111
+    call psb_errpush(info,name)
+    goto 9999
+  end if
+  lv%ac_nz_loc = lv%ac%get_nzeros()
+  lv%ac_nz_tot = lv%ac_nz_loc
+  call psb_sum(ictxt,lv%ac_nz_tot)
+  !  end do
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'Calling mlprcbld at level  ',i
+  call mld_check_def(lv%parms%sweeps,&
+       & 'Jacobi sweeps',ione,is_int_positive)
+  call mld_check_def(lv%parms%sweeps_pre,&
+       & 'Jacobi sweeps',ione,is_int_positive)
+  call mld_check_def(lv%parms%sweeps_post,&
+       & 'Jacobi sweeps',ione,is_int_positive)
+
+  call lv%sm%build(lv%base_a,lv%base_desc,&
+       & 'F',info,amold=amold,vmold=vmold,imold=imold)
+  if (info == 0) then
+    if (allocated(lv%sm2a)) then 
+      call lv%sm2a%build(lv%base_a,lv%base_desc,'F',info,&
+           & amold=amold,vmold=vmold,imold=imold)
+      lv%sm2 => lv%sm2a
+    else
+      lv%sm2 => lv%sm
+    end if
+  end if
+  if (info /=0) then
+    info = psb_err_internal_error_
+    call psb_errpush(info,name,&
+         & a_err='Smoother bld error')
+    goto 9999
+  end if
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+
+  return
+
+end subroutine mld_d_base_onelev_build