UNO R4をいろいろな環境でテスト中なんだけど、Win＆MacはOKで、Linuxはエラーが出る。
こんな感じ。

Arduino：1.8.19 (Linux), ボード："Arduino Uno R4 Minima"

/home/pi/.arduino15/packages/arduino/hardware/renesas_uno/1.0.2/cores/arduino/cm_backtrace/cm_backtrace.c: In function 'cm_backtrace_init':
/home/pi/.arduino15/packages/arduino/hardware/renesas_uno/1.0.2/cores/arduino/cm_backtrace/cm_backtrace.c:144:13: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
fw_name = firmware_name;
^
/home/pi/.arduino15/packages/arduino/hardware/renesas_uno/1.0.2/cores/arduino/cm_backtrace/cm_backtrace.c:145:12: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
hw_ver = hardware_ver;
^
/home/pi/.arduino15/packages/arduino/hardware/renesas_uno/1.0.2/cores/arduino/cm_backtrace/cm_backtrace.c:146:12: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
sw_ver = software_ver;
^
/home/pi/.arduino15/packages/arduino/tools/arm-none-eabi-gcc/7-2017q4/bin/arm-none-eabi-ar: error while loading shared libraries: libfl.so.2: cannot open shared object file: No such file or directory
exit status 127
/home/pi/arduino-1.8.19/arduino-builderが127を返しました。
ボードArduino UNO R4 Minimaに対するコンパイル時にエラーが発生しました。