diff --git a/coin/provisioning/qtci-linux-Ubuntu-24.04-aarch64/04-clang.sh b/coin/provisioning/qtci-linux-Ubuntu-24.04-aarch64/04-clang.sh
index d5564690..2ab6c38e 100644
--- a/coin/provisioning/qtci-linux-Ubuntu-24.04-aarch64/04-clang.sh
+++ b/coin/provisioning/qtci-linux-Ubuntu-24.04-aarch64/04-clang.sh
@@ -14,4 +14,11 @@ curl -L https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
 sudo apt-add-repository 'deb http://apt.llvm.org/noble/ llvm-toolchain-noble-20 main'
 
 sudo apt update
-sudo apt -y install clang-20 lldb-20 lld-20 libc++-20-dev
+sudo apt -y install clang-20 lldb-20 lld-20
+
+# note: installing the libc++ development files conflicts with libgstreamer1.0-dev
+# * installing libunwind-20-dev from apt.llvm.org (as dependency of libc++-20-dev) will
+#   uninstall libgstreamer1.0-dev
+# * installing libunwind-20-dev from the Ubuntu repository will break gstreamer's pkg-config
+#   integration: https://bugs.launchpad.net/ubuntu/+source/llvm-toolchain-20/+bug/2134518
+# sudo apt -y libc++-20-dev