You must upgrade your ACS compiler to use ACSUtils because the official ACC 1.55 release can't compile files with more than 256 functions.

Upgrade to one of the following compilers:

ACC 1.56 Beta: DOWNLOAD. This archive also includes the latest Zandronum zcommon from https://github.com/Korshun/zcommon.

BCC

GDCC

Using ACSUtils

Download the latest release.

Add acsutils.acs to your project.

Use the code below to include ACSUtils into your project:

#include "zcommon.acs"
#include "acsutils.acs"

If you are making a mod for Zandronum, don't forget that you can name your scripts too.