Index: akonadi-19.08.0/src/akonadicontrol/agentmanager.cpp
===================================================================
--- akonadi-19.08.0.orig/src/akonadicontrol/agentmanager.cpp
+++ akonadi-19.08.0/src/akonadicontrol/agentmanager.cpp
@@ -78,12 +78,12 @@ AgentManager::AgentManager(bool verbose,
     mStorageController = new Akonadi::ProcessControl;
     mStorageController->setShutdownTimeout(15 * 1000);   // the server needs more time for shutdown if we are using an internal mysqld
     connect(mStorageController, &Akonadi::ProcessControl::unableToStart, this, &AgentManager::serverFailure);
-    mStorageController->start(QStringLiteral("akonadiserver"), serviceArgs, Akonadi::ProcessControl::RestartOnCrash);
+    mStorageController->start(QLatin1String(NIX_OUT "/bin/akonadiserver"), serviceArgs, Akonadi::ProcessControl::RestartOnCrash);
 
     if (mAgentServerEnabled) {
         mAgentServer = new Akonadi::ProcessControl;
         connect(mAgentServer, &Akonadi::ProcessControl::unableToStart, this, &AgentManager::agentServerFailure);
-        mAgentServer->start(QStringLiteral("akonadi_agent_server"), serviceArgs, Akonadi::ProcessControl::RestartOnCrash);
+        mAgentServer->start(QLatin1String(NIX_OUT "/bin/akonadi_agent_server"), serviceArgs, Akonadi::ProcessControl::RestartOnCrash);
     }
 }
 
Index: akonadi-19.08.0/src/akonadicontrol/agentprocessinstance.cpp
===================================================================
--- akonadi-19.08.0.orig/src/akonadicontrol/agentprocessinstance.cpp
+++ akonadi-19.08.0/src/akonadicontrol/agentprocessinstance.cpp
@@ -62,7 +62,7 @@ bool AgentProcessInstance::start(const A
     } 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;
Index: akonadi-19.08.0/src/server/storage/dbconfigmysql.cpp
===================================================================
--- akonadi-19.08.0.orig/src/server/storage/dbconfigmysql.cpp
+++ akonadi-19.08.0/src/server/storage/dbconfigmysql.cpp
@@ -83,7 +83,6 @@ bool DbConfigMysql::init(QSettings &sett
     // determine default settings depending on the driver
     QString defaultHostName;
     QString defaultOptions;
-    QString defaultServerPath;
     QString defaultCleanShutdownCommand;
 
 #ifndef Q_OS_WIN
@@ -92,16 +91,7 @@ bool DbConfigMysql::init(QSettings &sett
 #endif
 
     const bool defaultInternalServer = true;
-#ifdef MYSQLD_EXECUTABLE
-    if (QFile::exists(QStringLiteral(MYSQLD_EXECUTABLE))) {
-        defaultServerPath = QStringLiteral(MYSQLD_EXECUTABLE);
-    }
-#endif
-    if (defaultServerPath.isEmpty()) {
-        defaultServerPath = findExecutable(QStringLiteral("mysqld"));
-    }
-
-    const QString mysqladminPath = findExecutable(QStringLiteral("mysqladmin"));
+    const QString mysqladminPath = QLatin1String(NIXPKGS_MYSQL_MYSQLADMIN);
     if (!mysqladminPath.isEmpty()) {
 #ifndef Q_OS_WIN
         defaultCleanShutdownCommand = QStringLiteral("%1 --defaults-file=%2/mysql.conf --socket=%3/%4 shutdown")
@@ -111,10 +101,10 @@ bool DbConfigMysql::init(QSettings &sett
 #endif
     }
 
-    mMysqlInstallDbPath = findExecutable(QStringLiteral("mysql_install_db"));
+    mMysqlInstallDbPath = QLatin1String(NIXPKGS_MYSQL_MYSQL_INSTALL_DB);
     qCDebug(AKONADISERVER_LOG) << "Found mysql_install_db: " << mMysqlInstallDbPath;
 
-    mMysqlCheckPath = findExecutable(QStringLiteral("mysqlcheck"));
+    mMysqlCheckPath = QLatin1String(NIXPKGS_MYSQL_MYSQLCHECK);
     qCDebug(AKONADISERVER_LOG) << "Found mysqlcheck: " << mMysqlCheckPath;
 
     mInternalServer = settings.value(QStringLiteral("QMYSQL/StartServer"), defaultInternalServer).toBool();
@@ -131,7 +121,7 @@ bool DbConfigMysql::init(QSettings &sett
     mUserName = settings.value(QStringLiteral("User")).toString();
     mPassword = settings.value(QStringLiteral("Password")).toString();
     mConnectionOptions = settings.value(QStringLiteral("Options"), defaultOptions).toString();
-    mMysqldPath = settings.value(QStringLiteral("ServerPath"), defaultServerPath).toString();
+    mMysqldPath = QLatin1String(NIXPKGS_MYSQL_MYSQLD);
     mCleanServerShutdownCommand = settings.value(QStringLiteral("CleanServerShutdownCommand"), defaultCleanShutdownCommand).toString();
     settings.endGroup();
 
@@ -141,9 +131,6 @@ bool DbConfigMysql::init(QSettings &sett
         // intentionally not namespaced as we are the only one in this db instance when using internal mode
         mDatabaseName = QStringLiteral("akonadi");
     }
-    if (mInternalServer && (mMysqldPath.isEmpty() || !QFile::exists(mMysqldPath))) {
-        mMysqldPath = defaultServerPath;
-    }
 
     qCDebug(AKONADISERVER_LOG) << "Using mysqld:" << mMysqldPath;
 
@@ -152,9 +139,6 @@ bool DbConfigMysql::init(QSettings &sett
     settings.setValue(QStringLiteral("Name"), mDatabaseName);
     settings.setValue(QStringLiteral("Host"), mHostName);
     settings.setValue(QStringLiteral("Options"), mConnectionOptions);
-    if (!mMysqldPath.isEmpty()) {
-        settings.setValue(QStringLiteral("ServerPath"), mMysqldPath);
-    }
     settings.setValue(QStringLiteral("StartServer"), mInternalServer);
     settings.endGroup();
     settings.sync();
@@ -209,7 +193,7 @@ 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()) {
Index: akonadi-19.08.0/src/server/storage/dbconfigpostgresql.cpp
===================================================================
--- akonadi-19.08.0.orig/src/server/storage/dbconfigpostgresql.cpp
+++ akonadi-19.08.0/src/server/storage/dbconfigpostgresql.cpp
@@ -140,9 +140,7 @@ bool DbConfigPostgresql::init(QSettings
     // determine default settings depending on the driver
     QString defaultHostName;
     QString defaultOptions;
-    QString defaultServerPath;
     QString defaultInitDbPath;
-    QString defaultPgUpgradePath;
     QString defaultPgData;
 
 #ifndef Q_WS_WIN // We assume that PostgreSQL is running as service on Windows
@@ -153,12 +151,8 @@ bool DbConfigPostgresql::init(QSettings
 
     mInternalServer = settings.value(QStringLiteral("QPSQL/StartServer"), defaultInternalServer).toBool();
     if (mInternalServer) {
-        const auto paths = postgresSearchPaths(QStringLiteral("/usr/lib/postgresql"));
-
-        defaultServerPath = QStandardPaths::findExecutable(QStringLiteral("pg_ctl"), paths);
-        defaultInitDbPath = QStandardPaths::findExecutable(QStringLiteral("initdb"), paths);
+        defaultInitDbPath = QLatin1String(NIXPKGS_POSTGRES_INITDB);
         defaultHostName = Utils::preferredSocketDirectory(StandardDirs::saveDir("data", QStringLiteral("db_misc")));
-        defaultPgUpgradePath = QStandardPaths::findExecutable(QStringLiteral("pg_upgrade"), paths);
         defaultPgData = StandardDirs::saveDir("data", QStringLiteral("db_data"));
     }
 
@@ -177,20 +171,14 @@ bool DbConfigPostgresql::init(QSettings
     mUserName = settings.value(QStringLiteral("User")).toString();
     mPassword = settings.value(QStringLiteral("Password")).toString();
     mConnectionOptions = settings.value(QStringLiteral("Options"), defaultOptions).toString();
-    mServerPath = settings.value(QStringLiteral("ServerPath"), defaultServerPath).toString();
-    if (mInternalServer && mServerPath.isEmpty()) {
-        mServerPath = defaultServerPath;
-    }
+    mServerPath = QLatin1String(NIXPKGS_POSTGRES_PG_CTL);
     qCDebug(AKONADISERVER_LOG) << "Found pg_ctl:" << mServerPath;
     mInitDbPath = settings.value(QStringLiteral("InitDbPath"), defaultInitDbPath).toString();
     if (mInternalServer && mInitDbPath.isEmpty()) {
         mInitDbPath = defaultInitDbPath;
     }
     qCDebug(AKONADISERVER_LOG) << "Found initdb:" << mServerPath;
-    mPgUpgradePath = settings.value(QStringLiteral("UpgradePath"), defaultPgUpgradePath).toString();
-    if (mInternalServer && mPgUpgradePath.isEmpty()) {
-        mPgUpgradePath = defaultPgUpgradePath;
-    }
+    mPgUpgradePath = QLatin1String(NIXPKGS_POSTGRES_PG_UPGRADE);
     qCDebug(AKONADISERVER_LOG) << "Found pg_upgrade:" << mPgUpgradePath;
     mPgData = settings.value(QStringLiteral("PgData"), defaultPgData).toString();
     if (mPgData.isEmpty()) {
@@ -206,7 +194,6 @@ bool DbConfigPostgresql::init(QSettings
         settings.setValue(QStringLiteral("Port"), mHostPort);
     }
     settings.setValue(QStringLiteral("Options"), mConnectionOptions);
-    settings.setValue(QStringLiteral("ServerPath"), mServerPath);
     settings.setValue(QStringLiteral("InitDbPath"), mInitDbPath);
     settings.setValue(QStringLiteral("StartServer"), mInternalServer);
     settings.endGroup();