diff -Nru qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/changelog qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/changelog
--- qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/changelog	2020-12-11 08:32:06.000000000 +0000
+++ qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/changelog	2021-08-10 11:14:11.000000000 +0000
@@ -1,3 +1,10 @@
+qtquickcontrols2-opensource-src (5.15.2+dfsg-3) experimental; urgency=medium
+
+  * Add qtquickcontrols2-5-private-dev package (closes: #958521).
+  * Update debian/watch: use version=4, and track only 5.15.x releases.
+
+ -- Dmitry Shachnev <mitya57@debian.org>  Tue, 10 Aug 2021 14:14:11 +0300
+
 qtquickcontrols2-opensource-src (5.15.2+dfsg-2) unstable; urgency=medium
 
   * Bump Standards-Version to 4.5.1, no changes needed.
diff -Nru qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/control qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/control
--- qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/control	2020-12-11 08:32:06.000000000 +0000
+++ qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/control	2021-08-10 11:14:11.000000000 +0000
@@ -108,6 +108,17 @@
  .
  This package contains the Qt Quick Controls 2 development files.
 
+Package: qtquickcontrols2-5-private-dev
+Section: libdevel
+Architecture: any
+Multi-Arch: same
+Depends: qtquickcontrols2-5-dev (= ${binary:Version}), ${misc:Depends}
+Description: Qt 5 Quick Controls 2 private development files
+ Qt is a cross-platform C++ application framework. Qt's primary feature
+ is its rich set of widgets that provide standard GUI functionality.
+ .
+ This package contains the Qt Quick Controls 2 private development files.
+
 Package: qtquickcontrols2-5-doc
 Build-Profiles: <!nodoc>
 Architecture: all
diff -Nru qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/not-installed qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/not-installed
--- qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/not-installed	2020-12-11 08:32:06.000000000 +0000
+++ qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/not-installed	2021-08-10 11:14:11.000000000 +0000
@@ -1,6 +1,2 @@
-usr/include/${DEB_HOST_MULTIARCH}/qt5/QtQuickControls2/5.*
-usr/include/${DEB_HOST_MULTIARCH}/qt5/QtQuickTemplates2/5.*
 usr/lib/${DEB_HOST_MULTIARCH}/libQt5QuickControls2.la
 usr/lib/${DEB_HOST_MULTIARCH}/libQt5QuickTemplates2.la
-usr/lib/${DEB_HOST_MULTIARCH}/qt5/mkspecs/modules/qt_lib_quickcontrols2_private.pri
-usr/lib/${DEB_HOST_MULTIARCH}/qt5/mkspecs/modules/qt_lib_quicktemplates2_private.pri
diff -Nru qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/qtquickcontrols2-5-private-dev.install qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/qtquickcontrols2-5-private-dev.install
--- qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/qtquickcontrols2-5-private-dev.install	1970-01-01 00:00:00.000000000 +0000
+++ qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/qtquickcontrols2-5-private-dev.install	2021-08-10 11:14:11.000000000 +0000
@@ -0,0 +1,4 @@
+usr/include/${DEB_HOST_MULTIARCH}/qt5/QtQuickControls2/5.*
+usr/include/${DEB_HOST_MULTIARCH}/qt5/QtQuickTemplates2/5.*
+usr/lib/${DEB_HOST_MULTIARCH}/qt5/mkspecs/modules/qt_lib_quickcontrols2_private.pri
+usr/lib/${DEB_HOST_MULTIARCH}/qt5/mkspecs/modules/qt_lib_quicktemplates2_private.pri
diff -Nru qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/watch qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/watch
--- qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/watch	2020-12-11 08:32:06.000000000 +0000
+++ qtquickcontrols2-opensource-src-5.15.2+dfsg/debian/watch	2021-08-10 11:14:11.000000000 +0000
@@ -1,3 +1,3 @@
-version=3
+version=4
 opts=uversionmangle=s/-/~/,dversionmangle=s/\+dfsg//,repacksuffix=+dfsg \
-https://download.qt.io/official_releases/qt/([\d\.]*)/([\d\.]*)/submodules/qtquickcontrols2-everywhere-src-(.*)\.tar\.xz
+https://download.qt.io/archive/qt/5.15/([\d\.]*)/submodules/qtquickcontrols2-everywhere-src-(.*)\.tar\.xz