Install on Ubuntu fails due to missing dependencies (libgtk)

Hello,

When installing on (X)Ubuntu 20.04 LTS, the build fails due to missing dependencies

  --- stderr
  `"pkg-config" "--libs" "--cflags" "gdk-3.0" "gdk-3.0 >= 3.18"` did not exit successfully: exit status: 1
  error: could not find system library 'gdk-3.0' required by the 'gdk-sys' crate

  --- stderr
  Package gdk-3.0 was not found in the pkg-config search path.
  Perhaps you should add the directory containing `gdk-3.0.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'gdk-3.0' found
  Package gdk-3.0 was not found in the pkg-config search path.
  Perhaps you should add the directory containing `gdk-3.0.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'gdk-3.0' found

Solution is simple, just install libgtk-3-dev before attempting to build.

sudo apt install libclang-dev libudev-dev
sudo apt-get install build-essential libgtk-3-dev
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
make
sudo make install