Error during compile: "undefined reference to `TelnetStream'"

[NorthyIE]

I ran into the same issue as this: #17, so I am currently trying to use the git master version instead of the release.

This does unfortunately not work for me either, I get these errors during compile, even when simply trying to compile the "TelnetStreamEsp8266Test"-example (to make sure that the issue is not related to my coding:

`> Executing task: C:\Users\Northy.platformio\penv\Scripts\platformio.exe run <

Processing d1_mini_lite (platform: espressif8266; board: d1_mini_lite; framework: arduino)

Verbose mode can be enabled via -v, --verbose option
CONFIGURATION: https://docs.platformio.org/page/boards/espressif8266/d1_mini_lite.html
PLATFORM: Espressif 8266 (3.2.0) > WeMos D1 mini Lite
HARDWARE: ESP8266 80MHz, 80KB RAM, 1MB Flash
PACKAGES:

• framework-arduinoespressif8266 3.30002.0 (3.0.2)
• tool-esptool 1.413.0 (4.13)
• tool-esptoolpy 1.30000.201119 (3.0.0)
• toolchain-xtensa 2.100300.210717 (10.3.0)
  LDF: Library Dependency Finder -> https://bit.ly/configure-pio-ldf
  LDF Modes: Finder ~ chain, Compatibility ~ soft
  Found 44 compatible libraries
  Scanning dependencies...
  Dependency Graph
  |-- 2.8.0
  |-- 0.1.5
  |-- 1.4.3
  | |-- 1.1.4
  |-- 1.1.4
  |-- 1.6.1
  |-- 1.0
  |-- 2.0.0
  | |-- 1.0
  Building in release mode
  Compiling .pio\build\d1_mini_lite\src\main.cpp.o
  Linking .pio\build\d1_mini_lite\firmware.elf
  c:/users/northy/.platformio/packages/toolchain-xtensa/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld.exe: .pio\build\d1_mini_lite\src\main.cpp.o:(.text.setup+0x2c): undefined reference to TelnetStream' c:/users/northy/.platformio/packages/toolchain-xtensa/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld.exe: .pio\build\d1_mini_lite\src\main.cpp.o:(.text.setup+0x30): undefined reference to _ZN17TelnetStreamClass5beginEi'
  c:/users/northy/.platformio/packages/toolchain-xtensa/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld.exe: .pio\build\d1_mini_lite\src\main.cpp.o: in function setup': main.cpp:(.text.setup+0xfa): undefined reference to _ZN17TelnetStreamClass5beginEi'
  c:/users/northy/.platformio/packages/toolchain-xtensa/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld.exe: .pio\build\d1_mini_lite\src\main.cpp.o:(.text.loop+0x8): undefined reference to _ZN17TelnetStreamClass4readEv' c:/users/northy/.platformio/packages/toolchain-xtensa/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld.exe: .pio\build\d1_mini_lite\src\main.cpp.o:(.text.loop+0xc): undefined reference to _ZN17TelnetStreamClass4stopEv'
  c:/users/northy/.platformio/packages/toolchain-xtensa/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld.exe: .pio\build\d1_mini_lite\src\main.cpp.o:(.text.loop+0x10): undefined reference to _ZN17TelnetStreamClass5flushEv' c:/users/northy/.platformio/packages/toolchain-xtensa/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld.exe: .pio\build\d1_mini_lite\src\main.cpp.o:(.text.loop+0x26): undefined reference to _ZN17TelnetStreamClass4readEv'
  c:/users/northy/.platformio/packages/toolchain-xtensa/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld.exe: .pio\build\d1_mini_lite\src\main.cpp.o: in function loop': main.cpp:(.text.loop+0x38): undefined reference to _ZN17TelnetStreamClass4stopEv'
  c:/users/northy/.platformio/packages/toolchain-xtensa/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld.exe: main.cpp:(.text.loop+0x59): undefined reference to _ZN17TelnetStreamClass5flushEv' c:/users/northy/.platformio/packages/toolchain-xtensa/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld.exe: main.cpp:(.text.loop+0x62): undefined reference to _ZN17TelnetStreamClass4stopEv'
  collect2.exe: error: ld returned 1 exit status
  *** [.pio\build\d1_mini_lite\firmware.elf] Error 1
  ================================================================================================= [FAILED] Took 2.93 seconds =================================================================================================`

[JAndrassy]

TelnetStream.cpp was not compiled