diff --git a/cppcheck-2.2-online-help_q_readonly.patch b/cppcheck-2.2-online-help_q_readonly.patch
new file mode 100644
index 0000000..d86ed93
--- /dev/null
+++ b/cppcheck-2.2-online-help_q_readonly.patch
@@ -0,0 +1,31 @@
+From 4a057c181373626f6e1538a2edf46cc4741fe7bf Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Wolfgang=20St=C3=B6ggl?= <c72578@yahoo.de>
+Date: Sun, 8 Nov 2020 15:06:14 +0100
+Subject: [PATCH] Set _q_readonly property for online-help (#2890)
+
+- Setting _q_readonly disables the timestamp check of the registered
+  online-help.qch file
+- This enables displaying of Contents and Index of the online help,
+  even if the timestamp of online-help.qch is slightly different.
+  Differences in the timestamp can result from packing online-help.qch
+  in a cab file, when building the installer (1 or 2 seconds) or from
+  installing the file under a different timezone under Linux etc.
+- Remark: Qt 5.14 or newer is required to display Contents or Index,
+  when the help files are readonly
+---
+ gui/helpdialog.cpp | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/gui/helpdialog.cpp b/gui/helpdialog.cpp
+index c158c8092f..ce24aa1c3a 100644
+--- a/gui/helpdialog.cpp
++++ b/gui/helpdialog.cpp
+@@ -66,6 +66,8 @@ HelpDialog::HelpDialog(QWidget *parent) :
+     }
+ 
+     mHelpEngine = new QHelpEngine(helpFile);
++    // Disable the timestamp check of online-help.qhc by setting _q_readonly
++    mHelpEngine->setProperty("_q_readonly", QVariant::fromValue<bool>(true));
+     mHelpEngine->setupData();
+ 
+     mUi->contents->addWidget(mHelpEngine->contentWidget());
diff --git a/cppcheck.spec b/cppcheck.spec
index ff3c7ec..6007af0 100644
--- a/cppcheck.spec
+++ b/cppcheck.spec
@@ -2,7 +2,7 @@
 
 Name:           cppcheck
 Version:        2.2
-Release:        4%{?dist}
+Release:        5%{?dist}
 Summary:        Tool for static C/C++ code analysis
 License:        GPLv3+
 URL:            http://cppcheck.wiki.sourceforge.net/
@@ -21,6 +21,8 @@ Patch3:         cppcheck-2.2-exprengine.patch
 Patch4:         cppcheck-2.2-online-help.patch
 # Fix for missing #include with gcc-11
 Patch5:         cppcheck-gcc11.patch
+# https://github.com/danmar/cppcheck/pull/2890
+Patch6:         cppcheck-2.2-online-help_q_readonly.patch
 
 BuildRequires:  gcc-c++
 BuildRequires:  pcre-devel
@@ -69,11 +71,12 @@ from xml files first generated using cppcheck.
 %patch3 -p1 -b .exprengine
 %patch4 -p1 -b .online-help
 %patch5 -p1 -b .gcc11
+%patch6 -p1 -b .online-help_q_readonly
 # Make sure bundled tinyxml is not used
 rm -r externals/tinyxml
 # Generate the Qt online-help file
 cd gui/help
-TZ=UTC qhelpgenerator-qt5 online-help.qhcp -o online-help.qhc
+qhelpgenerator-qt5 online-help.qhcp -o online-help.qhc
 
 %build
 # Manuals
@@ -122,13 +125,10 @@ cd %{_vpath_builddir}/bin
 %files htmlreport
 %{_bindir}/cppcheck-htmlreport
 
-%post
-# Adjust the timestamp of online-help.qch to the value expected by online-help.qhc
-# The rpm is built on servers using UTC. Get this UTC timestamp and apply it to the file under the local TZ
-# https://github.com/danmar/cppcheck/commit/9693940dadfd54bb0bac2549e1b2d6804be9a1a8#commitcomment-43482215
-touch -a -m -t $(TZ=UTC date -r /usr/share/Cppcheck/help/online-help.qch +%Y%m%d%H%M.%%S) /usr/share/Cppcheck/help/online-help.qch
-
 %changelog
+* Sun Nov 08 2020 Wolfgang Stöggl <c72578@yahoo.de> - 2.2-5
+- Add cppcheck-2.2-online-help_q_readonly.patch
+
 * Thu Oct 22 2020 Wolfgang Stöggl <c72578@yahoo.de> - 2.2-4
 - Fix missing Contents and Index in Qt online-help file