On JUCE 5.3.2, since the sample project “extras/AudioPluginHost” has configuration LADSPA enabled, compile error occurs with the message “ladspa.h not found”.
In order to solve the above problem, I ran the following command.
$ sudo apt-get install ladspa-sdk
Therefore, I recommend the installation command like below.
$ sudo apt-get install clang freeglut3-dev g++ libasound2-dev libcurl4-openssl-dev libfreetype6-dev libjack-jackd2-dev libx11-dev libxcomposite-dev libxcursor-dev libxinerama-dev libxrandr-dev mesa-common-dev webkit2gtk-4.0 ladspa-sdk