diff --git a/cmake/QtSyncQtHelpers.cmake b/cmake/QtSyncQtHelpers.cmake
index 76a88954901..9cdad4c07c2 100644
--- a/cmake/QtSyncQtHelpers.cmake
+++ b/cmake/QtSyncQtHelpers.cmake
@@ -84,6 +84,13 @@ function(qt_internal_target_sync_headers target
     # std::filesystem API
     get_filename_component(source_dir_real "${sync_source_directory}" REALPATH)
     get_filename_component(binary_dir_real "${CMAKE_CURRENT_BINARY_DIR}" REALPATH)
+    if(QT6_INSTALL_PREFIX)
+        get_filename_component(install_dir_real "${QT6_INSTALL_PREFIX}" REALPATH)
+        set(install_include_dir_argument
+            -installIncludeDir "${install_dir_real}/${QT6_INSTALL_HEADERS}")
+    else()
+        set(install_include_dir_argument "")
+    endif()
 
     if(QT_REPO_PUBLIC_NAMESPACE_REGEX)
         set(public_namespaces_filter -publicNamespaceFilter "${QT_REPO_PUBLIC_NAMESPACE_REGEX}")
@@ -113,6 +120,7 @@ function(qt_internal_target_sync_headers target
         -binaryDir "${binary_dir_real}"
         -privateHeadersFilter "${private_filter_regex}"
         -includeDir "${module_build_interface_include_dir}"
+        ${install_include_dir_argument}
         -privateIncludeDir "${module_build_interface_private_include_dir}"
         -qpaIncludeDir "${module_build_interface_qpa_include_dir}"
         -rhiIncludeDir "${module_build_interface_rhi_include_dir}"
diff --git a/src/tools/syncqt/main.cpp b/src/tools/syncqt/main.cpp
index ab646e6cd14..be14700f6f0 100644
--- a/src/tools/syncqt/main.cpp
+++ b/src/tools/syncqt/main.cpp
@@ -205,6 +205,8 @@ public:
 
     const std::string &includeDir() const { return m_includeDir; }
 
+    const std::string &installIncludeDir() const { return m_installIncludeDir; }
+
     const std::string &privateIncludeDir() const { return m_privateIncludeDir; }
 
     const std::string &qpaIncludeDir() const { return m_qpaIncludeDir; }
@@ -339,6 +341,7 @@ private:
             { "-module", { &m_moduleName } },
             { "-sourceDir", { &m_sourceDir } },
             { "-binaryDir", { &m_binaryDir } },
+            { "-installIncludeDir", { &m_installIncludeDir, true } },
             { "-privateHeadersFilter", { &privateHeadersFilter, true } },
             { "-qpaHeadersFilter", { &qpaHeadersFilter, true } },
             { "-rhiHeadersFilter", { &rhiHeadersFilter, true } },
@@ -499,10 +502,10 @@ private:
     // Convert all paths from command line to a generic one.
     void normilizePaths()
     {
-        static std::array<std::string *, 8> paths = {
-            &m_sourceDir,     &m_binaryDir,  &m_includeDir,        &m_privateIncludeDir,
-            &m_qpaIncludeDir, &m_rhiIncludeDir, &m_stagingDir,
-            &m_versionScriptFile,
+        const std::array<std::string *, 9> paths = {
+            &m_sourceDir,         &m_binaryDir,         &m_includeDir,
+            &m_installIncludeDir, &m_privateIncludeDir, &m_qpaIncludeDir,
+            &m_rhiIncludeDir,     &m_stagingDir,        &m_versionScriptFile,
         };
         for (auto path : paths) {
             if (!path->empty())
@@ -514,6 +517,7 @@ private:
     std::string m_sourceDir;
     std::string m_binaryDir;
     std::string m_includeDir;
+    std::string m_installIncludeDir;
     std::string m_privateIncludeDir;
     std::string m_qpaIncludeDir;
     std::string m_rhiIncludeDir;
@@ -1328,8 +1332,11 @@ public:
                         }
                         for (const auto &module : m_commandLineArgs->knownModules()) {
                             std::string suggestedHeader = "Qt" + module + '/' + includedHeader;
-                            if (std::filesystem::exists(m_commandLineArgs->includeDir() + "/../"
-                                                        + suggestedHeader)) {
+                            const std::string suggestedHeaderReversePath = "/../" + suggestedHeader;
+                            if (std::filesystem::exists(m_commandLineArgs->includeDir()
+                                                        + suggestedHeaderReversePath)
+                                || std::filesystem::exists(m_commandLineArgs->installIncludeDir()
+                                                           + '/' + suggestedHeader)) {
                                 faults |= IncludeChecks;
                                 std::cerr << m_warningMessagePreamble << m_currentFileString
                                           << ":" << m_currentFileLineNumber