test for awk

[[Imported from SVN: r5408]]

m4/dune.m4

@@ -31,9 +31,11 @@ AC_DEFUN([DUNE_MODULE_ADD_SUMMARY_ENTRY],[
   DUNE_ADD_SUMMARY_MOD_ENTRY(_dune_name,[$result])
 ])
 
-m4_define([_dune_sub_version],"`echo $1 | awk -F. -v FIELD=$2 '{ print int($FIELD) }'`")
+m4_define([_dune_sub_version],"`echo $1 | $AWK -F. -v FIELD=$2 '{ print int($FIELD) }'`")
 
 AC_DEFUN([DUNE_PARSE_MODULE_VERSION],[
+  AC_REQUIRE([AC_PROG_AWK])
+
   m4_pushdef([_dune_name], [$1])
   m4_pushdef([_dune_version], [$2])
   m4_pushdef([_dune_module], [m4_translit(_dune_name, [-], [_])])