Тоже беда с компиляцией.
Самое интересное, что если скопировать из 1.8.1 и вставить в 1.8.7, то компиляция проходит нормально и загрузка в Nano, но не работает.
Arduino: 1.8.1 (Windows 10), Плата:"Arduino Nano, ATmega328P (Old Bootloader)"
c:\Program Files (x86)\FLProg\ideV2\arduino-builder -dump-prefs -logger=machine -hardware c:\Program Files (x86)\FLProg\ideV2\hardware -hardware c:\Program Files (x86)\FLProg\ideV2\portable\packages -tools c:\Program Files (x86)\FLProg\ideV2\tools-builder -tools c:\Program Files (x86)\FLProg\ideV2\hardware\tools\avr -tools c:\Program Files (x86)\FLProg\ideV2\portable\packages -built-in-libraries c:\Program Files (x86)\FLProg\ideV2\libraries -libraries c:\Program Files (x86)\FLProg\ideV2\portable\sketchbook\libraries -fqbn=arduino:avr:nano:cpu=atmega328old -ide-version=10801 -build-path C:\Users\17D3~1\AppData\Local\Temp\arduino_build_999837 -warnings=more -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avr-gcc.path=c:\Program Files (x86)\FLProg\ideV2\portable\packages\arduino\tools\avr-gcc\4.9.2-atmel3.5.4-arduino2 -prefs=runtime.tools.arduinoOTA.path=c:\Program Files (x86)\FLProg\ideV2\portable\packages\arduino\tools\arduinoOTA\1.1.1 -prefs=runtime.tools.avrdude.path=c:\Program Files (x86)\FLProg\ideV2\portable\packages\arduino\tools\avrdude\6.3.0-arduino9 -verbose C:\Users\Денис\AppData\Local\Temp\flprog\pr14\pr14.ino
c:\Program Files (x86)\FLProg\ideV2\arduino-builder -compile -logger=machine -hardware c:\Program Files (x86)\FLProg\ideV2\hardware -hardware c:\Program Files (x86)\FLProg\ideV2\portable\packages -tools c:\Program Files (x86)\FLProg\ideV2\tools-builder -tools c:\Program Files (x86)\FLProg\ideV2\hardware\tools\avr -tools c:\Program Files (x86)\FLProg\ideV2\portable\packages -built-in-libraries c:\Program Files (x86)\FLProg\ideV2\libraries -libraries c:\Program Files (x86)\FLProg\ideV2\portable\sketchbook\libraries -fqbn=arduino:avr:nano:cpu=atmega328old -ide-version=10801 -build-path C:\Users\17D3~1\AppData\Local\Temp\arduino_build_999837 -warnings=more -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avr-gcc.path=c:\Program Files (x86)\FLProg\ideV2\portable\packages\arduino\tools\avr-gcc\4.9.2-atmel3.5.4-arduino2 -prefs=runtime.tools.arduinoOTA.path=c:\Program Files (x86)\FLProg\ideV2\portable\packages\arduino\tools\arduinoOTA\1.1.1 -prefs=runtime.tools.avrdude.path=c:\Program Files (x86)\FLProg\ideV2\portable\packages\arduino\tools\avrdude\6.3.0-arduino9 -verbose C:\Users\Денис\AppData\Local\Temp\flprog\pr14\pr14.ino
Using board 'nano' from platform in folder: c:\Program Files (x86)\FLProg\ideV2\hardware\arduino\avr
Using core 'arduino' from platform in folder: c:\Program Files (x86)\FLProg\ideV2\hardware\arduino\avr
Detecting libraries used...
"c:\Program Files (x86)\FLProg\ideV2\portable\packages\arduino\tools\avr-gcc\4.9.2-atmel3.5.4-arduino2/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -flto -w -x c++ -E -CC -mmcu= -DF_CPU=16000000L -DARDUINO=10801 -DARDUINO_AVR_NANO -DARDUINO_ARCH_AVR "-Ic:\Program Files (x86)\FLProg\ideV2\hardware\arduino\avr\cores\arduino" "-Ic:\Program Files (x86)\FLProg\ideV2\hardware\arduino\avr\variants\eightanaloginputs" "C:\Users\17D3~1\AppData\Local\Temp\arduino_build_999837\sketch\pr14.ino.cpp" -o "nul"
Generating function prototypes...
"c:\Program Files (x86)\FLProg\ideV2\portable\packages\arduino\tools\avr-gcc\4.9.2-atmel3.5.4-arduino2/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -flto -w -x c++ -E -CC -mmcu= -DF_CPU=16000000L -DARDUINO=10801 -DARDUINO_AVR_NANO -DARDUINO_ARCH_AVR "-Ic:\Program Files (x86)\FLProg\ideV2\hardware\arduino\avr\cores\arduino" "-Ic:\Program Files (x86)\FLProg\ideV2\hardware\arduino\avr\variants\eightanaloginputs" "C:\Users\17D3~1\AppData\Local\Temp\arduino_build_999837\sketch\pr14.ino.cpp" -o "C:\Users\17D3~1\AppData\Local\Temp\arduino_build_999837\preproc\ctags_target_for_gcc_minus_e.cpp"
avr-g++: error: missing device or architecture after '-mmcu='
exit status 1
Ошибка компиляции для платы Arduino Nano.