Interrupts no information in official documents

Official Hardware Nano Family Nano R4
26

Ok doing this I get:-

FQBN: arduino:renesas_uno:nanor4
Using board 'nanor4' from platform in folder: /Users/mikecook/Library/Arduino15/packages/arduino/hardware/renesas_uno/1.5.1
Using core 'arduino' from platform in folder: /Users/mikecook/Library/Arduino15/packages/arduino/hardware/renesas_uno/1.5.1

Detecting libraries used...
/Users/mikecook/Library/Arduino15/packages/arduino/tools/arm-none-eabi-gcc/7-2017q4/bin/arm-none-eabi-g++ -c -w -Os -g3 -fno-use-cxa-atexit -fno-rtti -fno-exceptions -nostdlib -DF_CPU=48000000 -DARDUINO_NANO_R4 -DARDUINO_UNOR4_MINIMA -std=gnu++17 -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -fsigned-char -ffunction-sections -fdata-sections -fmessage-length=0 -fno-builtin -w -x c++ -E -CC -DARDUINO=10607 -DPROJECT_NAME="/Users/mikecook/Library/Caches/arduino/sketches/FC66A0C1D0D414BCF34D0336F874775C/sketch_oct12a.ino" -DARDUINO_nanor4 -DARDUINO_ARCH_RENESAS_UNO -DARDUINO_ARCH_RENESAS -DARDUINO_FSP -D_XOPEN_SOURCE=700 -mthumb @/Users/mikecook/Library/Arduino15/packages/arduino/hardware/renesas_uno/1.5.1/variants/NANOR4/defines.txt -DCFG_TUSB_MCU=OPT_MCU_RAXXX -I/Users/mikecook/Library/Arduino15/packages/arduino/hardware/renesas_uno/1.5.1/cores/arduino/tinyusb -I/Users/mikecook/Library/Arduino15/packages/arduino/hardware/renesas_uno/1.5.1/cores/arduino/api/deprecated -I/Users/mikecook/Library/Arduino15/packages/arduino/hardware/renesas_uno/1.5.1/cores/arduino/api/deprecated-avr-comp -I/Users/mikecook/Library/Arduino15/packages/arduino/hardware/renesas_uno/1.5.1/cores/arduino -I/Users/mikecook/Library/Arduino15/packages/arduino/hardware/renesas_uno/1.5.1/variants/NANOR4 -iprefix/Users/mikecook/Library/Arduino15/packages/arduino/hardware/renesas_uno/1.5.1 @/Users/mikecook/Library/Arduino15/packages/arduino/hardware/renesas_uno/1.5.1/variants/NANOR4/includes.txt /Users/mikecook/Library/Caches/arduino/sketches/FC66A0C1D0D414BCF34D0336F874775C/sketch/sketch_oct12a.ino.cpp -o /dev/null
/private/var/folders/0r/5d65776n19q2wvp1wf4bjsxr0000gn/T/.arduinoIDE-unsaved2025912-6193-1lcpzp5.p92yg/sketch_oct12a/sketch_oct12a.ino:1:10: fatal error: Encoder.h: No such file or directory
 void setup() {
          ^~~~~      
compilation terminated.
Alternatives for Encoder.h: []
ResolveLibrary(Encoder.h)
  -> candidates: []
exit status 1

Compilation error: Encoder.h: No such file or directory