Presumably as the old kernel version doesn’t support the capabilities.

A quick fix is to downgrade to the old 2.6.9 version here. Bear in mind the risks of running an older version that won’t get security patches etc.

The setting you’re looking for is listed under “Window manager tweaks”.

1. XFCE menu
2. Settings
3. Window Manager Tweaks
4. Focus
5. “When a window raises itself”
6. “Do nothing”

From StackExchange

Bloom is a REST API caching middleware, acting as a reverse proxy between your load balancers and your REST API workers.
It is completely agnostic of your API implementation, and requires minimal changes to your existing API code to work.
Bloom relies on redis, configured as a cache to store cached data. It is built in Rust and focuses on stability, performance and low resource usage.

Peaclock uses C++17, this requires us to go through some hoops.

sudo apt install clang-7 llvm-7-dev
git clone https://github.com/octobanana/peaclock.git
cd peaclock
export CC=/usr/bin/clang-7
export CXX=/usr/bin/clang++-7
find . -type f -exec sed -i -e \ 
's#std::filesystem#std::experimental::filesystem#g' {} \;
find . -type f -exec sed -i -e  \
's#<filesystem>#<experimental/filesystem>#g' {} \;
find . -type f -exec sed -i -e \
's/lexically_normal().//g' {} \; # HACK!
./build.sh
./install.sh