Can't compile Gateway-MQTT project

[Lama1121]

I'm getting following error when compiling Gateway-MQTT
Arduino: 1.8.13 (Windows 10), Board: "ATmega328, No bootloader, EEPROM retained, 328PB, BOD 2.7V, LTO disabled, External 8 MHz"

c:/rob/arduino-1.8.13/hardware/tools/avr/bin/../lib/gcc/avr/7.3.0/../../../../avr/bin/ld.exe: C:\Users\WJCWSM~1.EUR\AppData\Local\Temp\arduino_build_885427/Gateway-MQTT.ino.elf section .data' will not fit in region text'

c:/rob/arduino-1.8.13/hardware/tools/avr/bin/../lib/gcc/avr/7.3.0/../../../../avr/bin/ld.exe: region `text' overflowed by 70 bytes

collect2.exe: error: ld returned 1 exit status

exit status 1

Error compiling for board ATmega328.
Using UIPEthernet version 2.0.9
and MySensors version 2.3.2

[feanor-anglin]

Please enable LTO, it should help.