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:

#library "project"
// ACSUtils settings:
#define ACSUTILS_HUDLIB_SAVEDSTATES 16
#define TIDALLOCSTART 15000
// Includes:
#include "zcommon.acs"
#include "acsutils.acs"
// Your project's error handler (you can put it anywhere you want, in a different file, even):
function void ACSUtilsErrorHandler(int type, int message)
{
Log(s:"error: ", s:message);
printbold(s:"error: ", s:message);
}
// Your project's code follows.

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