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diff --git a/m4/psi/psi_const.m4 b/m4/psi/psi_const.m4
new file mode 100644
index 0000000..6c3cf6b
--- /dev/null
+++ b/m4/psi/psi_const.m4
@@ -0,0 +1,51 @@
+# psi_add_str_const(name, value)
+# Add a pre-defined string constant to $PSI_CONSTS
+psi_add_str_const() {
+	grep -q "\"psi\\\\\\\\$1\"" $PSI_CONSTS \
+		|| cat >>$PSI_CONSTS <<EOF
+	{PSI_T_STRING, "string", "psi\\\\$1", $2, PSI_T_QUOTED_STRING},
+EOF
+}
+
+# psi_add_int_const(name, value)
+# Add a pre-defined int constant to $PSI_CONSTS
+psi_add_int_const() {
+	grep -q "\"psi\\\\\\\\$1\"" $PSI_CONSTS \
+		|| cat >>$PSI_CONSTS <<EOF
+	{PSI_T_INT, "int", "psi\\\\$1", "$2", PSI_T_NUMBER}, 
+EOF
+}
+
+dnl PSI_CONST(const name, type)
+dnl Check the value of a str/int constant and add it to the list of pre-defined
+dnl constants.
+AC_DEFUN(PSI_CONST, [
+	AC_CACHE_CHECK(value of $1, psi_cv_const_$1, [
+		psi_const_val=
+		case $2 in
+		str*)
+			if test "$cross_compiling" = "yes"
+			then
+				AC_TRY_CPP(PSI_INCLUDES $1, psi_const_val=`eval "$ac_try|tail -n1"`, psi_const_val=)
+			else
+				PSI_COMPUTE_STR(psi_const_val, $1, PSI_INCLUDES)
+			fi
+			;;
+		int)
+			AC_COMPUTE_INT(psi_const_val, $1, PSI_INCLUDES)
+			;;
+		esac
+		psi_cv_const_$1=$psi_const_val
+	])
+	if test "$psi_cv_const_$1"
+	then
+		case $2 in
+		str*)
+			psi_add_str_const "$1" "$psi_cv_const_$1"
+			;;
+		int)
+			psi_add_int_const "$1" "$psi_cv_const_$1"
+			;;
+		esac
+	fi
+])