undefined reference to `analogRead'

[dzanis]

c:/users/zanis/.platformio/packages/toolchain-riscv/bin/../lib/gcc/riscv-none-embed/8.2.0/../../../../riscv-none-embed/bin/ld.exe: .pio\build\genericCH32V003F4P6\src\main.cpp.o: in function loop': main.cpp:(.text.loop+0xa): undefined reference to analogRead' collect2.exe: error: ld returned 1 exit status *** [.pio\build\genericCH32V003F4P6\firmware.elf] Error 1