diff --git a/base/modules/psb_error_impl.F90 b/base/modules/psb_error_impl.F90
index 1529b1a1..4f550be8 100644
--- a/base/modules/psb_error_impl.F90
+++ b/base/modules/psb_error_impl.F90
@@ -39,6 +39,10 @@ subroutine psb_serror()
       end do
     end if
   end if
+#if defined(HAVE_FLUSH_STMT)
+  flush(0) 
+#endif
+
 
 end subroutine psb_serror
 
@@ -72,9 +76,6 @@ subroutine psb_perror(ictxt)
         call psb_errmsg(err_c, r_name, i_e_d, a_e_d,iam)
         !            write(0,'(50("="))')
       end do
-#if defined(HAVE_FLUSH_SUB)
-      call flush(0) 
-#endif
 #if defined(HAVE_FLUSH_STMT)
       flush(0) 
 #endif
@@ -90,9 +91,6 @@ subroutine psb_perror(ictxt)
       do while (psb_get_numerr() > 0)
         call psb_errpop(err_c, r_name, i_e_d, a_e_d)
       end do
-#if defined(HAVE_FLUSH_SUB)
-      call flush(0) 
-#endif
 #if defined(HAVE_FLUSH_STMT)
       flush(0) 
 #endif
diff --git a/config/pac.m4 b/config/pac.m4
index 206e75a7..752c5a05 100644
--- a/config/pac.m4
+++ b/config/pac.m4
@@ -1264,3 +1264,53 @@ else
         $2
 fi
 ])dnl PAC_LAPACK
+
+dnl @synopsis PAC_FORTRAN_TEST_FLUSH( [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
+dnl
+dnl Will try to compile and link a program checking the FLUSH Fortran support.
+dnl
+dnl Will use MPIFC, otherwise '$FC'.
+dnl
+dnl If the test passes, will execute ACTION-IF-FOUND. Otherwise, ACTION-IF-NOT-FOUND.
+dnl Note : This file will be likely to induce the compiler to create a module file
+dnl (for a module called conftest).
+dnl Depending on the compiler flags, this could cause a conftest.mod file to appear
+dnl in the present directory, or in another, or with another name. So be warned!
+dnl
+dnl @author Michele Martone <michele.martone@uniroma2.it>
+dnl @author Salvatore Filippone <salvatore.filippone@uniroma2.it>
+AC_DEFUN(PAC_FORTRAN_TEST_FLUSH,
+ac_exeext=''
+ac_ext='f90'
+ac_link='${MPIFC-$FC} -o conftest${ac_exeext} $FCFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&5'
+dnl Warning : square brackets are EVIL!
+[AC_MSG_CHECKING([support for Fortran FLUSH statement])
+i=0
+while test \( -f tmpdir_$i \) -o \( -d tmpdir_$i \) ; do
+  i=`expr $i + 1`
+done
+mkdir tmpdir_$i
+cd tmpdir_$i
+cat > conftest.$ac_ext <<EOF
+program conftest
+   integer :: iunit=10
+   open(10)
+   write(10,*) 'Test '
+   flush(10)
+   close(10)
+end program conftest
+EOF
+if AC_TRY_EVAL(ac_link) && test -s conftest${ac_exeext}; then
+  AC_MSG_RESULT([yes])
+  ifelse([$1], , :, [
+  $1])
+else
+  AC_MSG_RESULT([no])
+  echo "configure: failed program was:" >&AC_FD_CC
+  cat conftest.$ac_ext >&AC_FD_CC
+ifelse([$2], , , [  
+  $2
+])dnl
+fi
+cd ..
+rm -fr tmpdir_$i])
diff --git a/configure b/configure
index bad37952..74abad84 100755
--- a/configure
+++ b/configure
@@ -7427,9 +7427,9 @@ $as_echo "no" >&6; }
   cat conftest.$ac_ext >&5
 
   { { $as_echo "$as_me:$LINENO: error: Sorry, cannot build PSBLAS without support for TR15581.
- Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.5." >&5
+ Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.6." >&5
 $as_echo "$as_me: error: Sorry, cannot build PSBLAS without support for TR15581.
- Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.5." >&2;}
+ Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.6." >&2;}
    { (exit 1); exit 1; }; }
 
 fi
@@ -7473,9 +7473,9 @@ $as_echo "no" >&6; }
   cat conftest.$ac_ext >&5
 
   { { $as_echo "$as_me:$LINENO: error: Sorry, cannot build PSBLAS without support for EXTENDS.
- Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.5." >&5
+ Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.6." >&5
 $as_echo "$as_me: error: Sorry, cannot build PSBLAS without support for EXTENDS.
- Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.5." >&2;}
+ Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.6." >&2;}
    { (exit 1); exit 1; }; }
 
 fi
@@ -7538,9 +7538,9 @@ $as_echo "no" >&6; }
   cat conftest.$ac_ext >&5
 
   { { $as_echo "$as_me:$LINENO: error: Sorry, cannot build PSBLAS without support for CLASS and type bound procedures.
- Please get a Fortran compiler that supports them, e.g. GNU Fortran 4.5." >&5
+ Please get a Fortran compiler that supports them, e.g. GNU Fortran 4.6." >&5
 $as_echo "$as_me: error: Sorry, cannot build PSBLAS without support for CLASS and type bound procedures.
- Please get a Fortran compiler that supports them, e.g. GNU Fortran 4.5." >&2;}
+ Please get a Fortran compiler that supports them, e.g. GNU Fortran 4.6." >&2;}
    { (exit 1); exit 1; }; }
 
 fi
@@ -7575,10 +7575,10 @@ $as_echo "no" >&6; }
   echo "configure: failed program was:" >&5
   cat conftest.$ac_ext >&5
   rm -rf conftest*
-  { { $as_echo "$as_me:$LINENO: error: Sorry, cannot build PSBLAS without support for EXTENDS.
- Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.5." >&5
-$as_echo "$as_me: error: Sorry, cannot build PSBLAS without support for EXTENDS.
- Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.5." >&2;}
+  { { $as_echo "$as_me:$LINENO: error: Sorry, cannot build PSBLAS without support for MOVE_ALLOC.
+ Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.6." >&5
+$as_echo "$as_me: error: Sorry, cannot build PSBLAS without support for MOVE_ALLOC.
+ Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.6." >&2;}
    { (exit 1); exit 1; }; }
 
 fi
@@ -7622,6 +7622,44 @@ fi
 cd ..
 rm -fr tmpdir_$i
 
+ac_exeext=''
+ac_ext='f90'
+ac_link='${MPIFC-$FC} -o conftest${ac_exeext} $FCFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&5'
+{ $as_echo "$as_me:$LINENO: checking support for Fortran FLUSH statement" >&5
+$as_echo_n "checking support for Fortran FLUSH statement... " >&6; }
+i=0
+while test \( -f tmpdir_$i \) -o \( -d tmpdir_$i \) ; do
+  i=`expr $i + 1`
+done
+mkdir tmpdir_$i
+cd tmpdir_$i
+cat > conftest.$ac_ext <<EOF
+program conftest
+   integer :: iunit=10
+   open(10)
+   write(10,*) 'Test '
+   flush(10)
+   close(10)
+end program conftest
+EOF
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && test -s conftest${ac_exeext}; then
+  { $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+  FDEFINES="$psblas_cv_define_prepend-DHAVE_FLUSH_STMT $FDEFINES"
+else
+  { $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+fi
+cd ..
+rm -fr tmpdir_$i
+
 ac_exeext=''
 ac_ext='f90'
 ac_link='${MPIFC-$FC} -o conftest${ac_exeext} $FCFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&5'
diff --git a/configure.ac b/configure.ac
index 7370ba53..61760cb1 100755
--- a/configure.ac
+++ b/configure.ac
@@ -508,24 +508,24 @@ fi
 PAC_FORTRAN_TEST_TR15581( 
 	[],
         [AC_MSG_ERROR([Sorry, cannot build PSBLAS without support for TR15581. 
- Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.5.])]
+ Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.6.])]
 )
 
 PAC_FORTRAN_TEST_EXTENDS( 
 	[],
         [AC_MSG_ERROR([Sorry, cannot build PSBLAS without support for EXTENDS. 
- Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.5.])]
+ Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.6.])]
 )
 
 PAC_FORTRAN_TEST_CLASS_TBP( 
 	[],
         [AC_MSG_ERROR([Sorry, cannot build PSBLAS without support for CLASS and type bound procedures. 
- Please get a Fortran compiler that supports them, e.g. GNU Fortran 4.5.])]
+ Please get a Fortran compiler that supports them, e.g. GNU Fortran 4.6.])]
 )
 PAC_FORTRAN_HAVE_MOVE_ALLOC(
 	[FDEFINES="$psblas_cv_define_prepend-DHAVE_MOVE_ALLOC $FDEFINES"],
-        [AC_MSG_ERROR([Sorry, cannot build PSBLAS without support for EXTENDS. 
- Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.5.])]
+        [AC_MSG_ERROR([Sorry, cannot build PSBLAS without support for MOVE_ALLOC. 
+ Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.6.])]
 )
 
 #
@@ -536,6 +536,10 @@ PAC_FORTRAN_TEST_VOLATILE(
 	[FDEFINES="$psblas_cv_define_prepend-DHAVE_VOLATILE $FDEFINES"],
 )
 
+PAC_FORTRAN_TEST_FLUSH( 
+	[FDEFINES="$psblas_cv_define_prepend-DHAVE_FLUSH_STMT $FDEFINES"],
+)
+
 PAC_FORTRAN_TEST_FINAL( 
 	[FDEFINES="$psblas_cv_define_prepend-DHAVE_FINAL $FDEFINES"],
 )