diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 088d13e5..d2e8fc12 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -30,3 +30,18 @@ jobs:
       run: qmake
     - name: make
       run: make
+
+# This requires too much disk space (more than 40 GB), so it is disabled for now:
+
+#   wasm:
+#
+#     runs-on: ubuntu-latest
+#
+#     steps:
+#     - uses: actions/checkout@v1
+#     - name: prerequisites
+#       run: sudo apt update && sudo apt install build-essential libclang-13-dev cmake ninja-build libgl-dev libegl-dev libfontconfig-dev
+#     - name: compile-qt-web
+#       run: cd tools && ./compile-qt-web
+#     - name: compile-xaos-web
+#       run: cd tools && ./compile-xaos-web
diff --git a/XaoS.pro b/XaoS.pro
index 405d0354..80978d63 100644
--- a/XaoS.pro
+++ b/XaoS.pro
@@ -89,7 +89,7 @@ wasm{
 executable.files = bin/xaos
 executable.path = $$PREFIX/bin
 examples.path = $$PREFIX/share/XaoS/examples
-examples.extra = find examples -name \'*.xpf\' -exec cp {} $$PREFIX/share/XaoS/examples \;
+examples.extra = find examples -name \'*.xpf\' -exec cp {} $(INSTALL_ROOT)$$PREFIX/share/XaoS/examples \;
 catalogs.files = catalogs/*.cat
 catalogs.path = $$PREFIX/share/XaoS/catalogs
 tutorial.files = tutorial/*.x?f
diff --git a/src/util/xstdio.cpp b/src/util/xstdio.cpp
index 2c0f7d55..61fe6b31 100644
--- a/src/util/xstdio.cpp
+++ b/src/util/xstdio.cpp
@@ -171,10 +171,14 @@ xio_file xio_getrandomexample(xio_path name)
     };
 
     // Select a random sub dir and then random example to fix load random example issue
+
+    // if ../examples exists, add its subdirectories to example_path_taken, otherwise do nothing:
     QStringList sub_names = get_immediate_subdirectory_names(".." XIO_PATHSEPSTR "examples");
-    int randomIndex = QRandomGenerator::global()->bounded(sub_names.length());
-    QString randomElement = sub_names.at(randomIndex);
-    example_paths_taken.append(".." XIO_PATHSEPSTR "examples/"+randomElement);
+    if (sub_names.length() > 0) {
+        int randomIndex = QRandomGenerator::global()->bounded(sub_names.length());
+        QString randomElement = sub_names.at(randomIndex);
+        example_paths_taken.append(".." XIO_PATHSEPSTR "examples/"+randomElement);
+    }
     char *paths[example_paths_taken.size()];
     convertQStringListToArray(example_paths_taken, paths);
 
diff --git a/tools/README.md b/tools/README.md
index 7811e55a..8b5b83c0 100644
--- a/tools/README.md
+++ b/tools/README.md
@@ -21,11 +21,21 @@ Before running the script `deploy-win.bat` from command line you need to
 add the path of tools `windeployqt.exe` and `binarycreator.exe` to the
 environmental system variable PATH.
 
+Important: `windeployqt.exe` will use the first C++ compiler from the path.
+To avoid getting the wrong DLLs (because of availability of multiple compilers
+on your system) make sure that the used compiler is found as first one.
+If you use the wrong DLLs, XaoS will not start.
+
+See also https://stackoverflow.com/questions/43397609/qt-deployment-for-windows-copies-incorrect-dll-for-mingw
+
 To avoid problems with finding certain files, you should make sure that
 there is no special character in the full path of the `XaoS` folder.
 Otherwise some files may be missing from the installation bundle (for
 example, the .cat files).
 
+To create the .zip file, simply copy the bin folder in it and also the
+folders catalog/, examples/ and tutorial/.
+
 MacOS
 -----
 
diff --git a/tools/compile-qt-web b/tools/compile-qt-web
new file mode 100755
index 00000000..2247449f
--- /dev/null
+++ b/tools/compile-qt-web
@@ -0,0 +1,46 @@
+#!/bin/bash
+
+# This script compiles Qt6 to be able to build XaoS for WebAssembly.
+# Make sure that you have enough disk space. At least 45 GB is recommended.
+
+# See also https://doc.qt.io/qt-6.5/wasm.html and https://wiki.qt.io/Building_Qt_6_from_Git.
+
+QT6_VERSION=6.5.3
+EMSDK_VERSION=3.1.25
+PARALLEL=4
+
+QT6_HOST_PATH=`pwd`/qt6-host-install
+
+set -e
+
+# Get emscripten:
+test -x emsdk || git clone https://github.com/emscripten-core/emsdk.git
+cd emsdk
+git pull
+./emsdk install $EMSDK_VERSION
+./emsdk activate --embedded $EMSDK_VERSION
+cd ..
+
+# Get Qt:
+git clone git://code.qt.io/qt/qt5.git qt6
+cd qt6
+git switch $QT6_VERSION
+perl init-repository
+
+# Compile Qt for the Linux host
+cd ..
+mkdir qt6-host-build
+cd qt6-host-build
+../qt6/configure -prefix $QT6_HOST_PATH
+cmake --build . --parallel $PARALLEL
+cmake --install .
+
+# Compile Qt for WebAssembly
+cd ..
+mkdir qt6-wasm-build
+cd qt6-wasm-build
+. ../emsdk/emsdk_env.sh
+../qt6/configure -xplatform wasm-emscripten -nomake examples -prefix $PWD/qtbase \
+ -opensource -confirm-license -qt-host-path $QT6_HOST_PATH -device-option QT_EMSCRIPTEN_ASYNCIFY=1
+cmake --build . --parallel $PARALLEL -t qtbase -t qtdeclarative -t qtimageformats -t qsvgicon -t qsvg
+cd ..
diff --git a/tools/compile-xaos-web b/tools/compile-xaos-web
new file mode 100755
index 00000000..f5d124ad
--- /dev/null
+++ b/tools/compile-xaos-web
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+# This script compiles XaoS for WebAssembly.
+
+set -e
+
+QT6_WASM_BUILD=`pwd`/qt6-wasm-build
+test -x $QT6_WASM_BUILD || {
+ echo "Run compile-qt-web first."
+ exit 1
+ }
+
+. emsdk/emsdk_env.sh
+cd ..
+$QT6_WASM_BUILD/qtbase/bin/qmake
+make || true
diff --git a/tools/create-deb b/tools/create-deb
index ac90aef6..98115ce5 100755
--- a/tools/create-deb
+++ b/tools/create-deb
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
-# This script creates a .deb package of XaoS 4.0 and above.
-# Make sure you build the program first ("qmake PREFIX=/usr && make -j4").
+# This script creates a .deb package of XaoS 4.3 and above.
+# Make sure you build the program first ("qmake6 PREFIX=/usr && make -j4").
 # Required packages before running this script:
 # lynx pandoc git-extras lintian
 
@@ -55,7 +55,7 @@ Upstream-Name: xaos
 Source: https://github.com/xaos-project/XaoS
 
 Files: *
-Copyright: 2020 The XaoS Project
+Copyright: 2023 The XaoS Project
 License: GPL-1" > "$DOCDIR/copyright"
 
 git-changelog -x > "$DOCDIR/changelog"