Why doenst this work?

mkosi.extra/etc/ld.so.conf.d/opt-local.conf

@@ -0,0 +1,2 @@
+/opt/local/lib
+/opt/local/lib64

mkosi.extra/etc/ld.so.conf.d/opt-local.conf.license

@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+# SPDX-FileCopyrightText: 2026 Hadi Chokr <hadichokr@icloud.com>

mkosi.extra/etc/man_db.conf

@@ -0,0 +1,134 @@
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+# SPDX-FileCopyrightText: 2026 Hadi Chokr <hadichokr@icloud.com>
+#
+# man_db.conf
+#
+# This file is used by the man-db package to configure the man and cat paths.
+# It is also used to provide a manpath for those without one by examining
+# their PATH environment variable. For details see the manpath(5) man page.
+#
+# Lines beginning with `#' are comments and are ignored. Any combination of
+# tabs or spaces may be used as `whitespace' separators.
+#
+# There are three mappings allowed in this file:
+# --------------------------------------------------------
+# MANDATORY_MANPATH			manpath_element
+# MANPATH_MAP		path_element	manpath_element
+# MANDB_MAP		global_manpath	[relative_catpath]
+#---------------------------------------------------------
+# every automatically generated MANPATH includes these fields
+#
+#MANDATORY_MANPATH 			/usr/src/pvm3/man
+#
+MANDATORY_MANPATH			/usr/man
+MANDATORY_MANPATH			/usr/share/man
+MANDATORY_MANPATH			/opt/local/share/man
+#---------------------------------------------------------
+# set up PATH to MANPATH mapping
+# ie. what man tree holds man pages for what binary directory.
+#
+#		*PATH*        ->	*MANPATH*
+#
+MANPATH_MAP	/bin			/usr/share/man
+MANPATH_MAP	/usr/bin		/usr/share/man
+MANPATH_MAP	/sbin			/usr/share/man
+MANPATH_MAP	/usr/sbin		/usr/share/man
+MANPATH_MAP	/opt/local/bin		/opt/local/man
+MANPATH_MAP	/opt/local/bin		/opt/local/share/man
+MANPATH_MAP	/opt/local/sbin		/opt/local/man
+MANPATH_MAP	/opt/local/sbin		/opt/local/share/man
+MANPATH_MAP	/usr/X11R6/bin		/opt/X11R6/man
+MANPATH_MAP	/usr/bin/X11		/opt/X11R6/man
+MANPATH_MAP	/usr/games		/usr/share/man
+MANPATH_MAP	/opt/bin		/opt/man
+MANPATH_MAP	/opt/sbin		/opt/man
+#---------------------------------------------------------
+# For a manpath element to be treated as a system manpath (as most of those
+# above should normally be), it must be mentioned below. Each line may have
+# an optional extra string indicating the catpath associated with the
+# manpath. If no catpath string is used, the catpath will default to the
+# given manpath.
+#
+# You *must* provide all system manpaths, including manpaths for alternate
+# operating systems, locale specific manpaths, and combinations of both, if
+# they exist, otherwise the permissions of the user running man/mandb will
+# be used to manipulate the manual pages. Also, mandb will not initialise
+# the database cache for any manpaths not mentioned below unless explicitly
+# requested to do so.
+#
+# In a per-user configuration file, this directive only controls the
+# location of catpaths and the creation of database caches; it has no effect
+# on privileges.
+#
+# Any manpaths that are subdirectories of other manpaths must be mentioned
+# *before* the containing manpath. E.g. /usr/man/preformat must be listed
+# before /usr/man.
+#
+#		*MANPATH*     ->	*CATPATH*
+#
+MANDB_MAP	/usr/man		/var/cache/man/fsstnd
+MANDB_MAP	/usr/share/man		/var/cache/man
+MANDB_MAP	/opt/local/man		/var/cache/man/oldlocal
+MANDB_MAP	/opt/local/share/man	/var/cache/man/local
+MANDB_MAP	/usr/X11R6/man		/var/cache/man/X11R6
+MANDB_MAP	/opt/man		/var/cache/man/opt
+#
+#---------------------------------------------------------
+# Program definitions.  These are commented out by default as the value
+# of the definition is already the default.  To change: uncomment a
+# definition and modify it.
+#
+#DEFINE 	pager	less
+#DEFINE 	cat	cat
+#DEFINE 	tr	tr '\255\267\264\327' '\055\157\047\170'
+#DEFINE		grep	grep
+#DEFINE 	troff 	groff -mandoc
+#DEFINE 	nroff 	nroff -mandoc
+#DEFINE 	eqn 	eqn
+#DEFINE 	neqn	neqn
+#DEFINE 	tbl 	tbl
+#DEFINE 	col 	col
+#DEFINE 	vgrind
+#DEFINE 	refer 	refer
+#DEFINE 	grap
+#DEFINE 	pic 	pic -S
+#
+#DEFINE		compressor	gzip -c7
+#---------------------------------------------------------
+# Misc definitions: same as program definitions above.
+#
+#DEFINE		whatis_grep_flags		-i
+#DEFINE		apropos_grep_flags		-iEw
+#DEFINE		apropos_regex_grep_flags	-iE
+#---------------------------------------------------------
+# Section names. Manual sections will be searched in the order listed here;
+# the default is 1, n, l, 8, 3, 0, 2, 3type, 5, 4, 9, 6, 7. Multiple SECTION
+# directives may be given for clarity, and will be concatenated together in
+# the expected way.
+# If a particular extension is not in this list (say, 1mh), it will be
+# displayed with the rest of the section it belongs to. The effect of this
+# is that you only need to explicitly list extensions if you want to force a
+# particular order. Sections with extensions should usually be adjacent to
+# their main section (e.g. "1 1mh 8 ...").
+#
+SECTION		1 1p n l 8 3 3p 0 0p 2 3type 5 4 9 6 7
+#
+#---------------------------------------------------------
+# Range of terminal widths permitted when displaying cat pages. If the
+# terminal falls outside this range, cat pages will not be created (if
+# missing) or displayed.
+#
+#MINCATWIDTH	80
+#MAXCATWIDTH	80
+#
+# If CATWIDTH is set to a non-zero number, cat pages will always be
+# formatted for a terminal of the given width, regardless of the width of
+# the terminal actually being used. This should generally be within the
+# range set by MINCATWIDTH and MAXCATWIDTH.
+#
+#CATWIDTH	0
+#
+#---------------------------------------------------------
+# Flags.
+# NOCACHE keeps man from creating cat pages.
+#NOCACHE

mkosi.extra/etc/profile.d/99-local-precedence.sh

@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+# SPDX-FileCopyrightText: 2026 Hadi Chokr <hadichokr@icloud.com>
+
+# Setup PATH to let ~/.local and after that /opt/local mask everything
+export PATH="$HOME/.local/bin:$HOME/.local/sbin:/opt/local/sbin:/opt/local/bin:$PATH"
+
+# Prefixes
+export LOCAL_PREFIX=/opt/local
+export PREFIX=/opt/local
+export DESTDIR=/opt/local
+
+# For .desktop files and systemd
+export XDG_DATA_DIRS="$HOME/.local/share:/opt/local/share:${XDG_DATA_DIRS:-/usr/local/share:/usr/share}"
+export XDG_CONFIG_DIRS="$HOME/.config:/opt/local/etc/xdg:${XDG_CONFIG_DIRS:-/etc/xdg}"
+
+# pkgconfig
+export PKG_CONFIG_PATH="$HOME/.local/lib/pkgconfig:/opt/local/lib/pkgconfig:/opt/local/share/pkgconfig:${PKG_CONFIG_PATH:-}"

mkosi.extra/live/opt/local/bin/calamares

@@ -1,9 +1,10 @@
-#!/bin/sh
+#!/usr/bin/env bash
 # SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 # SPDX-FileCopyrightText: 2023 Harald Sitter <sitter@kde.org>
+# SPDX-FileCopyrightText: 2026 Hadi Chokr <hadichokr@icloud.com>
 
 if [ "$(id -u)" != "0" ]; then
-    exec pkexec /usr/local/bin/calamares "$@"
+    exec pkexec /opt/local/bin/calamares "$@"
 fi
 
 export KDE_FULL_SESSION=TRUE

mkosi.extra/usr/lib/environment.d/40-kde-linux-path.conf

@@ -1,8 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
-# SPDX-FileCopyrightText: 2025 Harald Sitter <sitter@kde.org>
-# SPDX-FileCopyrightText: 2026 Thomas Duckworth <tduck@filotimoproject.org>
-
-# Explicitly set PATH so we always have /usr/local binary paths in front, which we need
-# to mask binaries in /usr/bin.
-# Also, kde-builder wants .local/bin in the PATH and will fail if it is not.
-PATH=$HOME/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/bin

mkosi.extra/usr/lib/systemd/sysext.conf.d/mutable.conf

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+# SPDX-FileCopyrightText: 2026 Hadi Chokr <hadichokr@icloud.com>
+
+[SysExt]
+Mutable=auto
+

mkosi.extra/usr/lib/tmpfiles.d/sysext-trigger.conf

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+# SPDX-FileCopyrightText: 2026 Hadi Chokr <hadichokr@icloud.com>
+
+# Will trigger the systemd-sysext.service Condition to merge Extensions
+# TODO: Remove when https://github.com/systemd/systemd/issues/40827 is fixed
+f /etc/extensions/enable-sysext 0644 root root -

mkosi.extra/usr/lib/tmpfiles.d/usr-local.conf

@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+# SPDX-FileCopyrightText: 2026 Hadi Chokr <hadichokr@icloud.com>
+
+# Local admin prefix replacing /usr/local
+
+d /opt/local               0755 root root -
+d /opt/local/bin           0755 root root -
+d /opt/local/sbin          0755 root root -
+d /opt/local/lib           0755 root root -
+d /opt/local/lib64         0755 root root -
+d /opt/local/include       0755 root root -
+d /opt/local/share         0755 root root -
+d /opt/local/share/man     0755 root root -
+d /opt/local/share/info    0755 root root -
+d /opt/local/share/doc     0755 root root -
+d /opt/local/etc           0755 root root -
+d /opt/local/games         0755 root root -
+d /opt/local/src           0755 root root -
+d /opt/local/etc/xdg       0755 root root -
+d /opt/local/lib/pkgconfig 0755 root root -
+d /opt/local/share/pkgconfig 0755 root root -
+
+# sysext-routing
+d /var/lib/extensions.mutable 0755 root root -
+d /var/lib/extensions.mutable/usr 0755 root root -
+
+# Route /usr/local → /opt/local
+L /var/lib/extensions.mutable/usr/local - - - - /opt/local

mkosi.extra/usr/share/polkit-1/actions/org.kde.linux.calamares.policy

@@ -19,7 +19,7 @@
      <allow_inactive>no</allow_inactive>
      <allow_active>auth_admin</allow_active>
     </defaults>
-    <annotate key="org.freedesktop.policykit.exec.path">/usr/local/bin/calamares</annotate>
+    <annotate key="org.freedesktop.policykit.exec.path">/opt/local/bin/calamares</annotate>
     <annotate key="org.freedesktop.policykit.exec.allow_gui">true</annotate>
  </action>
 </policyconfig>

mkosi.finalize.d/40-core.sh.chroot

@@ -133,6 +133,9 @@ rm -rf \
   /usr/lib/modules/*/vdso \
   /usr/src/*
 
+## Get rid of /usr/local for /opt/local
+rm -rf /usr/local
+
 ## Replace Falkon with Firefox as the default browser, since that's what we pre-install.
 sed -i 's/org.kde.falkon.desktop/org.mozilla.firefox.desktop/' /usr/share/applications/kde-mimeapps.list