fixed some build file flaws

m4/ax_numval.m4

@@ -0,0 +1,25 @@
+#
+# This is a blindly modified variant of AC_CHECK_SIZEOF.
+#
+
+# AX_CHECK_NUMVALOF(TYPE, DEFAULT, [INCLUDES = DEFAULT-INCLUDES])
+# ---------------------------------------------------------------
+AC_DEFUN([AX_CHECK_NUMVALOF],
+	[AS_LITERAL_IF(m4_translit([[$1]], [[$2]], [p]), [],
+            [m4_fatal([$0: requires literal arguments])])]
+
+	[
+		_AC_CACHE_CHECK_INT(
+			[numeric value of $1],
+			[AS_TR_SH([ax_cv_numvalof_$1])],
+		     [($1)],
+			[AC_INCLUDES_DEFAULT([$3])],
+			[AS_TR_SH([ax_cv_numvalof_$1])=$2])
+
+		AC_DEFINE_UNQUOTED(
+			AS_TR_CPP(numvalof_$1),
+			$AS_TR_SH([ax_cv_numvalof_$1]),
+			[The size of `$1', as computed by valueof.])
+	]
+)# AX_CHECK_NUMVALOF
+