Index: aclocal.m4
===================================================================
--- aclocal.m4	(revision 2089)
+++ aclocal.m4	(working copy)
@@ -1504,7 +1504,16 @@
          parameter (nf_fill_uint  = 4294967295_8)
          parameter (nf_fill_int64 = -9223372036854775806_8) 
          end program]],
-        [ac_cv_fc_constant_modifier=yes])
+        [ac_cv_fc_constant_modifier=8],
+        AC_COMPILE_IFELSE([[
+         program main
+	 integer,parameter ::  EightByteInt = selected_int_kind(18)
+         integer*8 nf_fill_uint
+         integer*8  nf_fill_int64
+         parameter (nf_fill_uint  = 4294967295_EightByteInt)
+         parameter (nf_fill_int64 = -9223372036854775806_EightByteInt) 
+         end program]],
+        [ac_cv_fc_constant_modifier=EightByteInt]))
     ])
     AC_LANG_POP([Fortran 77])
 ])
Index: configure.in
===================================================================
--- configure.in	(revision 2089)
+++ configure.in	(working copy)
@@ -537,15 +537,20 @@
 
    UD_FC_CONSTANT_MODIFIER
    UD_MSG_DEBUG([ac_cv_fc_constant_modifier=$ac_cv_fc_constant_modifier])
+   PNF_INT_MODIFIER=""
    if test "x${ac_cv_fc_constant_modifier}" = xno ; then
       PNF_FILL_UINT=4294967295
       PNF_FILL_INT64=-9223372036854775806
       PNF_FILL_UINT64=18446744073709551614
    else
-      PNF_FILL_UINT=4294967295_8
-      PNF_FILL_INT64=-9223372036854775806_8
-      PNF_FILL_UINT64=18446744073709551614_8
+      if test "x${ac_cv_fc_constant_modifier}" = xEightByteInt ; then
+         PNF_INT_MODIFIER="	 integer,parameter ::  EightByteInt = selected_int_kind(18)"
+      fi
+      PNF_FILL_UINT=4294967295_${ac_cv_fc_constant_modifier}
+      PNF_FILL_INT64=-9223372036854775806_${ac_cv_fc_constant_modifier}
+      PNF_FILL_UINT64=18446744073709551614_${ac_cv_fc_constant_modifier}
    fi
+   AC_SUBST(PNF_INT_MODIFIER)
    AC_SUBST(PNF_FILL_UINT)
    AC_SUBST(PNF_FILL_INT64)
    AC_SUBST(PNF_FILL_UINT64)
Index: src/libf/pnetcdf.inc.in
===================================================================
--- src/libf/pnetcdf.inc.in	(revision 2089)
+++ src/libf/pnetcdf.inc.in	(working copy)
@@ -76,6 +76,7 @@
       parameter (nf_fill_double = 9.9692099683868690e+36)
       parameter (nf_fill_ubyte = 255)
       parameter (nf_fill_ushort = 65535)
+      @PNF_INT_MODIFIER@
       parameter (nf_fill_uint = @PNF_FILL_UINT@)
       parameter (nf_fill_int64 = @PNF_FILL_INT64@)
       ! parameter (nf_fill_uint64 = @PNF_FILL_UINT64@)  ! currently not supported