compile-log

First run is with librarys ONLY globally installed:
> Executing task in folder DCF77-Mutteruhr: platformio run <

Processing ATmega328P (platform: atmelavr; board: ATmega328P; framework: arduino)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/atmelavr/ATmega328P.html
PLATFORM: Atmel AVR 2.2.0 > ATmega328P/PA
HARDWARE: ATMEGA328P 16MHz, 2KB RAM, 31.50KB Flash
DEBUG: Current (simavr) On-board (simavr)
PACKAGES:
 - framework-arduino-avr-minicore 2.0.5
 - toolchain-atmelavr 1.50400.190710 (5.4.0)
LDF: Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 34 compatible libraries
Scanning dependencies...
Dependency Graph
|-- <LiquidCrystal> 1.5.0
|   |-- <Wire> 1.0
|-- <Wire> 1.0
|-- <dcf77_xtal> 3.3.4
Building in release mode
Compiling .pio/build/ATmega328P/src/main.cpp.o
In file included from src/main.cpp:20:0:
/Users/papi/.platformio/lib/dcf77_xtal_ID1482/dcf77.h: In member function 'uint8_t Internal::Binning::bins_t<data_type, noise_type, number_of_bins>::get_quality_factor()':
/Users/papi/.platformio/lib/dcf77_xtal_ID1482/dcf77.h:734:30: warning: typedef 'assert_type_is_known' locally defined but not used [-Wunused-local-typedefs]
                 typedef bool assert_type_is_known[TMP::equal<noise_type, uint8_t>::val ||
                              ^
/Users/papi/.platformio/lib/dcf77_xtal_ID1482/dcf77.h: In member function 'bool Internal::DCF77_Demodulator<Clock_Controller>::dummy_stage::data_ready() const':
/Users/papi/.platformio/lib/dcf77_xtal_ID1482/dcf77.h:1133:63: warning: no return statement in function returning non-void [-Wreturn-type]
             bool    data_ready()                       const {}
                                                               ^
/Users/papi/.platformio/lib/dcf77_xtal_ID1482/dcf77.h: In member function 'uint8_t Internal::DCF77_Demodulator<Clock_Controller>::dummy_stage::avg() const':
/Users/papi/.platformio/lib/dcf77_xtal_ID1482/dcf77.h:1134:63: warning: no return statement in function returning non-void [-Wreturn-type]
             uint8_t avg()                              const {}
                                                               ^
src/main.cpp: In function 'uint8_t MaxTicks::dcf77_Eingangspin()':
src/main.cpp:164:20: warning: unused variable 'ticks_per_cycle' [-Wunused-variable]
     static uint8_t ticks_per_cycle = 12;
                    ^
Linking .pio/build/ATmega328P/firmware.elf
Building .pio/build/ATmega328P/firmware.hex
Checking size .pio/build/ATmega328P/firmware.elf
Advanced Memory Usage is available via "PlatformIO Home > Project Inspect"
RAM:   [=====     ]  51.3% (used 1050 bytes from 2048 bytes)
Flash: [======    ]  57.0% (used 18400 bytes from 32256 bytes)
==================================================================================== [SUCCESS] Took 2.20 seconds ====================================================================================

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Now, second task with libraries linked via
ln -s /Users/papi/.platformio/lib/dcf77_xtal_ID1482 /Users/papi/Documents/Platformio/Projekte/DCF77-Mutteruhr/lib/dcf77_xtal_ID1482
ln -s /Users/papi/.platformio/lib/LiquidCrystal_ID136/ /Users/papi/Documents/Platformio/Projekte/DCF77-Mutteruhr/lib/LiquidCrystal_ID136

Output of ls -la:
lrwxr-xr-x   1 papi  staff    48 29 Jun 08:00 LiquidCrystal_ID136 -> /Users/papi/.platformio/lib/LiquidCrystal_ID136/
-rw-r--r--   1 papi  staff  1037 26 Jun 10:54 README
lrwxr-xr-x   1 papi  staff    45 29 Jun 07:56 dcf77_xtal_ID1482 -> /Users/papi/.platformio/lib/dcf77_xtal_ID1482

> Executing task in folder DCF77-Mutteruhr: platformio run <

Processing ATmega328P (platform: atmelavr; board: ATmega328P; framework: arduino)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/atmelavr/ATmega328P.html
PLATFORM: Atmel AVR 2.2.0 > ATmega328P/PA
HARDWARE: ATMEGA328P 16MHz, 2KB RAM, 31.50KB Flash
DEBUG: Current (simavr) On-board (simavr)
PACKAGES:
 - framework-arduino-avr-minicore 2.0.5
 - toolchain-atmelavr 1.50400.190710 (5.4.0)
LDF: Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 35 compatible libraries
Scanning dependencies...
Dependency Graph
|-- <LiquidCrystal> 1.5.0
|   |-- <Wire> 1.0
|-- <Wire> 1.0
|-- <dcf77_xtal> 3.3.4
Building in release mode
Checking size .pio/build/ATmega328P/firmware.elf
Advanced Memory Usage is available via "PlatformIO Home > Project Inspect"
RAM:   [=====     ]  51.3% (used 1050 bytes from 2048 bytes)
Flash: [======    ]  57.0% (used 18400 bytes from 32256 bytes)
==================================================================================== [SUCCESS] Took 1.06 seconds ====================================================================================

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No errors anymore!