This is based on the respectve patch from NixPkgs, but with the parts pinning
mysql and postgresql executables removed. The our package definition on why.

diff --git a/src/akonadicontrol/agentmanager.cpp b/src/akonadicontrol/agentmanager.cpp
--- a/src/akonadicontrol/agentmanager.cpp
+++ b/src/akonadicontrol/agentmanager.cpp
@@ -61,7 +61,7 @@ public:
                 []() {
                     QCoreApplication::instance()->exit(255);
                 });
-        start(QStringLiteral("akonadiserver"), args, RestartOnCrash);
+        start(QLatin1String(NIX_OUT "/bin/akonadiserver"), args, RestartOnCrash);
     }
 
     ~StorageProcessControl() override
@@ -84,7 +84,7 @@ public:
                 []() {
                     qCCritical(AKONADICONTROL_LOG) << "Failed to start AgentServer!";
                 });
-        start(QStringLiteral("akonadi_agent_server"), args, RestartOnCrash);
+        start(QLatin1String(NIX_OUT "/bin/akonadi_agent_server"), args, RestartOnCrash);
     }
 
     ~AgentServerProcessControl() override
diff --git a/src/akonadicontrol/agentprocessinstance.cpp b/src/akonadicontrol/agentprocessinstance.cpp
--- a/src/akonadicontrol/agentprocessinstance.cpp
+++ b/src/akonadicontrol/agentprocessinstance.cpp
@@ -62,7 +62,7 @@ bool AgentProcessInstance::start(const AgentType &agentInfo)
     } else {
         Q_ASSERT(agentInfo.launchMethod == AgentType::Launcher);
         const QStringList arguments = QStringList() << executable << identifier();
-        const QString agentLauncherExec = Akonadi::StandardDirs::findExecutable(QStringLiteral("akonadi_agent_launcher"));
+        const QString agentLauncherExec = QLatin1String(NIX_OUT "/bin/akonadi_agent_launcher");
         mController->start(agentLauncherExec, arguments);
     }
     return true;
diff --git a/src/server/storage/dbconfigmysql.cpp b/src/server/storage/dbconfigmysql.cpp
--- a/src/server/storage/dbconfigmysql.cpp
+++ b/src/server/storage/dbconfigmysql.cpp
@@ -209,7 +209,7 @@ bool DbConfigMysql::startInternalServer()
 #endif
 
     // generate config file
-    const QString globalConfig = StandardDirs::locateResourceFile("config", QStringLiteral("mysql-global.conf"));
+    const QString globalConfig = QLatin1String(NIX_OUT "/etc/xdg/akonadi/mysql-global.conf");
     const QString localConfig  = StandardDirs::locateResourceFile("config", QStringLiteral("mysql-local.conf"));
     const QString actualConfig = StandardDirs::saveDir("data") + QLatin1String("/mysql.conf");
     if (globalConfig.isEmpty()) {
avail'>...<span class='msg-tooltip'>Fixes &lt;https://issues.guix.gnu.org/74800&gt;.

The check for make-session stopped working after update to<tr><td><span title='2022-11-24 08:48:31 +0200'>2022-11-24</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=ee9bf36b8d901f470e46b283801dbe1e8d6d6615'>gnu: gawk: Update to 5.2.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gawk.scm (gawk): Update to 5.2.1.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2022-09-08 21:39:59 +0200'>2022-09-08</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=845bc594023e22fe1994afde29e2c3c4ae4343b9'>gnu: gawk: Update to 5.2.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gawk.scm (gawk): Update to 5.2.0.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2022-07-22 01:09:14 +0200'>2022-07-22</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=9044b086ddca64a62966a83cbf1b82d32dece89e'>Merge branch 'staging' into core-updates</a></td><td>Marius Bakke</td></tr>
<tr><td><span title='2022-07-08 17:36:51 +0200'>2022-07-08</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=e07fa9b04009f0b239931674e1a48536a52e3276'>gnu: Add cppawk and cppawk-egawk.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gawk.scm (cppawk, cppawk-egawk): New variables.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Paul A. Patience</td></tr>
<tr><td><span title='2022-07-08 17:36:38 +0200'>2022-07-08</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=1fed71ce1976db9edf95fc4b99cac75a281fb526'>gnu: Add egawk-next.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gawk.scm (egawk-next): New variable.

Signed-<tr><td><span title='2023-11-07 18:07:11 +0200'>2023-11-07</span></td><td><a href='/guix/commit/m4?id=220759226e93d76d8d80058f69f9d8b29714bbde'>build: Fix spelling in m4 macros.</a><span class='msg-avail'>...<span class='msg-tooltip'>* m4/guix.m4 (GUIX_CHECK_GUILE_SSH): Fix spelling of parameter.
(GUIX_CHECK_FILE_NAME_LIMITS): Fix spelling of maximum.

Change-Id: I93c80441393622a4bc06daa475eee13874cca527
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2023-03-16 12:37:03 +0100'>2023-03-16</span></td><td><a href='/guix/commit/m4?id=8e3dfb3d6dfc0f19bd9a9f9b163f0f3d7dccc865'>build: Correct guix_system on musl libc distros.</a><span class='msg-avail'>...<span class='msg-tooltip'>* m4/guix.m4 (GUIX_SYSTEM_TYPE): Add linux-musl* case. This prevents
the macro from mis-parsing the host OS, which causes breakage when
building from source.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Antero Mejr</td></tr>
 Patience</td></tr>
<tr><td><span title='2022-06-26 22:58:33 +0200'>2022-06-26</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=da25a43f2dc582249f50d67119ea894c216db048'>gnu: gawk: Use G-expressions and remove labels.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gawk.scm (gawk)[arguments]: Convert to G-expression.  Use
SEARCH-INPUT-FILE instead of label.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2022-06-26 22:58:33 +0200'>2022-06-26</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=003128f2f3e499b5064679a3ad4b63d911f3b777'>gnu: gawk: Update to 5.1.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gawk.scm (gawk): Update to 5.1.1.
[arguments]: Enable previously failing test.
</span></span></td><td>Marius Bakke</td></tr>