Hello, precompiled static library (.a files) works fine on Version 1.8.9. When I switch to 1.8.12, the same configuration won't work. Basically, when I compile in 1.8.12, it will skip compiling library cpp file which resulting linking issue if I set precompiled=true. If I remove precompiled=true, it won't add the search path for the static files and miss ldfalgs tag. Here is the library.properties name=TinyTouch version=0.1 author=Kangmin maintainer=kangmin <xukangmin@gmail.com> sentence=Enables Touch Interface paragraph=1 category=Sensors url=https://docs.tinycore.dev/en/latest/usage.html#touch architectures=avr precompiled=true ldflags=-lqtm_acq_runtime -lqtm_binding_layer -lqtm_touch_key I attach the library for your reference. [TinyTouch.zip](https://github.com/arduino/Arduino/files/4593512/TinyTouch.zip)