diff --git a/src/plugins/projectexplorer/devicesupport/idevice.cpp b/src/plugins/projectexplorer/devicesupport/idevice.cpp
index 50f552444b3..12ff8e3cac3 100644
--- a/src/plugins/projectexplorer/devicesupport/idevice.cpp
+++ b/src/plugins/projectexplorer/devicesupport/idevice.cpp
@@ -142,6 +142,7 @@ public:
     FilePath debugServerPath;
     FilePath debugDumperPath = Core::ICore::resourcePath("debugger/");
     FilePath qmlRunCommand;
+    bool qmlRunCommandChecked = false;
     bool emptyCommandAllowed = false;
 
     QList<Icon> deviceIcons;
@@ -603,12 +604,20 @@ void IDevice::setDebugServerPath(const FilePath &path)
 
 FilePath IDevice::qmlRunCommand() const
 {
+    if (!d->qmlRunCommandChecked) {
+        d->qmlRunCommandChecked = true;
+        QString runtime = d->qmlRunCommand.path();
+        if (runtime.isEmpty())
+           runtime = "qml";
+        d->qmlRunCommand = searchExecutableInPath(runtime);
+    }
     return d->qmlRunCommand;
 }
 
 void IDevice::setQmlRunCommand(const FilePath &path)
 {
     d->qmlRunCommand = path;
+    d->qmlRunCommandChecked = false;
 }
 
 void IDevice::setExtraData(Id kind, const QVariant &data)
diff --git a/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.cpp b/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.cpp
index 4ccb9ad48f0..559bdeb198c 100644
--- a/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.cpp
+++ b/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.cpp
@@ -107,9 +107,8 @@ void QmlBuildSystem::updateDeploymentData()
     }
 
     ProjectExplorer::DeploymentData deploymentData;
-    for (const auto &file : m_projectItem->files()) {
-        deploymentData.addFile(file, targetFile(file).parentDir().toString());
-    }
+    for (const auto &file : m_projectItem->files())
+        deploymentData.addFile(file, m_projectItem->targetDirectory());
 
     setDeploymentData(deploymentData);
 }
@@ -160,9 +159,7 @@ void QmlBuildSystem::triggerParsing()
 
 Utils::FilePath QmlBuildSystem::canonicalProjectDir() const
 {
-    return BuildSystem::target()
-            ->project()
-            ->projectFilePath()
+    return projectFilePath()
             .canonicalPath()
             .normalizedPathName()
             .parentDir();
@@ -188,10 +185,11 @@ void QmlBuildSystem::refresh(RefreshOptions options)
     QmlJS::ModelManagerInterface::ProjectInfo projectInfo
             = modelManager->defaultProjectInfoForProject(project(),
                                                          project()->files(Project::HiddenRccFolders));
-    const QStringList searchPaths = makeAbsolute(canonicalProjectDir(), customImportPaths());
-    for (const QString &searchPath : searchPaths)
-        projectInfo.importPaths.maybeInsert(Utils::FilePath::fromString(searchPath),
+
+    for (const QString &searchPath : customImportPaths()) {
+        projectInfo.importPaths.maybeInsert(projectFilePath().pathAppended(searchPath),
                                             QmlJS::Dialect::Qml);
+    }
 
     modelManager->updateProjectInfo(projectInfo, project());
 
@@ -370,22 +368,23 @@ bool QmlBuildSystem::setMainUiFileInMainFile(const Utils::FilePath &newMainUiFil
 
 Utils::FilePath QmlBuildSystem::targetDirectory() const
 {
-    if (DeviceTypeKitAspect::deviceTypeId(kit()) == ProjectExplorer::Constants::DESKTOP_DEVICE_TYPE)
-        return canonicalProjectDir();
-
-    return m_projectItem ? Utils::FilePath::fromString(m_projectItem->targetDirectory())
-                         : Utils::FilePath();
+    Utils::FilePath result;
+    if (DeviceTypeKitAspect::deviceTypeId(kit()) == ProjectExplorer::Constants::DESKTOP_DEVICE_TYPE) {
+        result = canonicalProjectDir();
+    } else if (IDevice::ConstPtr device = DeviceKitAspect::device(kit())) {
+        if (m_projectItem)
+            result = device->filePath(m_projectItem->targetDirectory());
+    }
+    return result;
 }
 
 Utils::FilePath QmlBuildSystem::targetFile(const Utils::FilePath &sourceFile) const
 {
-    const QDir sourceDir(m_projectItem ? m_projectItem->sourceDirectory().path()
-                                       : canonicalProjectDir().toString());
-    const QDir targetDir(targetDirectory().toString());
-    const QString relative = sourceDir.relativeFilePath(sourceFile.toString());
-    return Utils::FilePath::fromString(QDir::cleanPath(targetDir.absoluteFilePath(relative)));
+    const Utils::FilePath sourceDir = m_projectItem ? m_projectItem->sourceDirectory()
+                                             : canonicalProjectDir();
+    const Utils::FilePath relative = sourceFile.relativePathFrom(sourceDir);
+    return targetDirectory().resolvePath(relative);
 }
-
 void QmlBuildSystem::setSupportedLanguages(QStringList languages)
 {
         m_projectItem->setSupportedLanguages(languages);
@@ -396,18 +395,6 @@ void QmlBuildSystem::setPrimaryLanguage(QString language)
         m_projectItem->setPrimaryLanguage(language);
 }
 
-QStringList QmlBuildSystem::makeAbsolute(const Utils::FilePath &path,
-                                         const QStringList &relativePaths)
-{
-    if (path.isEmpty())
-        return relativePaths;
-
-    const QDir baseDir(path.toString());
-    return Utils::transform(relativePaths, [&baseDir](const QString &path) {
-        return QDir::cleanPath(baseDir.absoluteFilePath(path));
-    });
-}
-
 void QmlBuildSystem::refreshFiles(const QSet<QString> & /*added*/, const QSet<QString> &removed)
 {
     if (m_blockFilesUpdate) {
diff --git a/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.h b/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.h
index d275481f537..0a0e9cfcbaf 100644
--- a/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.h
+++ b/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.h
@@ -89,9 +89,6 @@ public:
     bool addFiles(const QStringList &filePaths);
     void refreshProjectFile();
 
-    static Utils::FilePath activeMainFilePath();
-    static QStringList makeAbsolute(const Utils::FilePath &path, const QStringList &relativePaths);
-
     void refreshFiles(const QSet<QString> &added, const QSet<QString> &removed);
 
     bool blockFilesUpdate() const;
diff --git a/src/plugins/qmlprojectmanager/qmlprojectrunconfiguration.cpp b/src/plugins/qmlprojectmanager/qmlprojectrunconfiguration.cpp
index 756a0707d4a..77db8b073f5 100644
--- a/src/plugins/qmlprojectmanager/qmlprojectrunconfiguration.cpp
+++ b/src/plugins/qmlprojectmanager/qmlprojectrunconfiguration.cpp
@@ -91,11 +91,9 @@ QmlProjectRunConfiguration::QmlProjectRunConfiguration(Target *target, Id id)
 
         // arguments from .qmlproject file
         const QmlBuildSystem *bs = qobject_cast<QmlBuildSystem *>(target->buildSystem());
-        const QStringList importPaths = QmlBuildSystem::makeAbsolute(bs->targetDirectory(),
-                                                                     bs->customImportPaths());
-        for (const QString &importPath : importPaths) {
+        for (const QString &importPath : bs->customImportPaths()) {
             cmd.addArg("-I");
-            cmd.addArg(importPath);
+            cmd.addArg(bs->targetDirectory().pathAppended(importPath).path());
         }
 
         for (const QString &fileSelector : bs->customFileSelectors()) {
@@ -114,8 +112,9 @@ QmlProjectRunConfiguration::QmlProjectRunConfiguration(Target *target, Id id)
         }
 
         const FilePath main = bs->targetFile(mainScript());
+
         if (!main.isEmpty())
-            cmd.addArg(main.nativePath());
+            cmd.addArg(main.path());
 
         return cmd;
     });
diff --git a/src/plugins/remotelinux/linuxdevice.cpp b/src/plugins/remotelinux/linuxdevice.cpp
index cc44dddb3c4..59af192eaa2 100644
--- a/src/plugins/remotelinux/linuxdevice.cpp
+++ b/src/plugins/remotelinux/linuxdevice.cpp
@@ -978,7 +978,6 @@ LinuxDevice::LinuxDevice()
     addDeviceAction({Tr::tr("Open Remote Shell"), [](const IDevice::Ptr &device, QWidget *) {
                          device->openTerminal(Environment(), FilePath());
                      }});
-    setQmlRunCommand(filePath("qml"));
 }
 
 void LinuxDevice::_setOsType(Utils::OsType osType)