Add library to CLion project

I have a new project created with PlatformIO in CLion. I've copied the _Servo-1.1.8_ library into the `include` directory.

#include <Arduino.h>
#include "Servo-1.1.8/src/Servo.h"

Servo servo;

void setup() {
}

void loop() {
}

I'm getting a compilation error though:

====================[ Build | Production | uno ]================================
C:\Users\USER_NAME\AppData\Local\JetBrains\Toolbox\apps\CLion\ch-0\213.5744.254\bin\cmake\win\bin\cmake.exe --build C:\Users\USER_NAME\Documents\Arduino\MultiServoCallibration\cmake-build-uno --target Production
[1/1] cmd.exe /C "cd /D C:\Users\USER_NAME\Documents\Arduino\MultiServoCallibration && platformio -c clion run -euno"
FAILED: CMakeFiles/Production C:/Users/USER_NAME/Documents/Arduino/MultiServoCallibration/cmake-build-uno/CMakeFiles/Production 
cmd.exe /C "cd /D C:\Users\USER_NAME\Documents\Arduino\MultiServoCallibration && platformio -c clion run -euno"
Processing uno (platform: atmelavr; board: uno; framework: arduino)
--------------------------------------------------------------------------------
Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/atmelavr/uno.html
PLATFORM: Atmel AVR (3.4.0) > Arduino Uno
HARDWARE: ATMEGA328P 16MHz, 2KB RAM, 31.50KB Flash
DEBUG: Current (avr-stub) On-board (avr-stub, simavr)
PACKAGES: 
- framework-arduino-avr 5.1.0 
- toolchain-atmelavr 1.70300.191015 (7.3.0)
LDF: Library Dependency Finder -> https://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 5 compatible libraries
Scanning dependencies...
No dependencies
Building in release mode
Compiling .pio\build\uno\src\main.cpp.o
Linking .pio\build\uno\firmware.elf
C:\Users\USER_NAME\AppData\Local\Temp\ccmN7v6f.ltrans0.ltrans.o: In function `_GLOBAL__sub_I_servo':
<artificial>:(.text.startup+0x98): undefined reference to `Servo::Servo()'
collect2.exe: error: ld returned 1 exit status
*** [.pio\build\uno\firmware.elf] Error 1
========================== [FAILED] Took 1.18 seconds ==========================
ninja: build stopped: subcommand failed.

I've never used CMake or CLion before, so it might well be something super simple like adding a line to some config to include that library.