Hi,

I have just tried and I hit the same error as you:

In file included from /build/slim-1.4.1/app.cpp:31:
/build/slim-1.4.1/log.h: In instantiation of 'LogUnit& LogUnit::operator<<(const Type&) [with Type = PAM::Exception]':
/build/slim-1.4.1/app.cpp:331:35:   required from here
/build/slim-1.4.1/log.h:34:25: error: no match for 'operator<<' (operand types are 'std::ostream' {aka 'std::basic_ostream<char>'} and 'const PAM::Exception')
   34 |                 *logOut << text; logOut->flush();
      |                 ~~~~~~~~^~~~~~~

Rob,

I think this is caused by removing the PAM.h include from log.h. Certainly the
attached patch fixes compilation for me.

Mark
>From 874f5fd2da065e5dd28d20385344559a0bf85857 Mon Sep 17 00:00:00 2001
From: Mark Hindley <mark@???>
Date: Wed, 29 May 2024 18:47:16 +0100
Subject: [PATCH] log.h: Restore required includes.

Fixes

In file included from /build/slim-1.4.1/app.cpp:31:
/build/slim-1.4.1/log.h: In instantiation of 'LogUnit& LogUnit::operator<<(const Type&) [with Type = PAM::Exception]':
/build/slim-1.4.1/app.cpp:331:35:   required from here
/build/slim-1.4.1/log.h:34:25: error: no match for 'operator<<' (operand types are 'std::ostream' {aka 'std::basic_ostream<char>'} and 'const PAM::Exception')
   34 |                 *logOut << text; logOut->flush();
      |                 ~~~~~~~~^~~~~~~
---
 log.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/log.h b/log.h
index 6b341f8..8c3ad25 100644
--- a/log.h
+++ b/log.h
@@ -13,6 +13,12 @@
#ifndef _LOG_H_
#define _LOG_H_

+#ifdef USE_CONSOLEKIT
+#include "Ck.h"
+#endif
+#ifdef USE_PAM
+#include "PAM.h"
+#endif
#include <fstream>

using namespace std;
--
2.39.2