Re: [PR PATCH] [Updated] Manual.md: recommend keeping systemd units

[CameronNemo <CameronNemo@users.noreply.github.com>]

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There is an updated pull request by CameronNemo against master on the void-packages repository

https://github.com/CameronNemo/void-packages systemd
https://github.com/void-linux/void-packages/pull/37395

Manual.md: recommend keeping systemd units
Closes #32481

[ci skip]

#### Testing the changes
- I tested the changes in this PR: **N/A**


A patch file from https://github.com/void-linux/void-packages/pull/37395.patch is attached

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From d486316769de6eaa9863724f50d17682c8b69825 Mon Sep 17 00:00:00 2001
From: Cameron Nemo <cnemo@tutanota.com>
Date: Thu, 2 Jun 2022 11:58:53 -0700
Subject: [PATCH] Manual.md: recommend keeping systemd units

Ref #32154
Closes #32481
---
 Manual.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Manual.md b/Manual.md
index 0f16aeb3875c..2f17549d52bf 100644
--- a/Manual.md
+++ b/Manual.md
@@ -1415,6 +1415,14 @@ If the service requires directories in parts of the system that are not generall
 temporary filesystems. Then use the `make_dirs` variable in the template to create
 those directories when the package is installed.
 
+If the package installs a systemd service file or other unit, leave it in place as a
+reference point so long as including it has no negative side effects.
+
+Examples of when *not* to install systemd units:
+
+1. When doing so changes runtime behavior of the packaged software.
+2. When it is done via a compile time flag that also changes build dependencies.
+
 <a id="32bit_pkgs"></a>
 ### 32bit packages