| Date | Problem | request for Help | related Information - might help to solve | 
| 23.07.2019      Arduino IDE 1.8.9 Tools --> Boards --> Boards Manager search esp32 esp32 by Espressif Systems 1.0.2 Install  | 
 Tool xtensa-esp32-elf-gcc is not available for your operating system. java.lang.RuntimeException: java.lang.Exception: Tool xtensa-esp32-elf-gcc is not available for your operating system. at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onInstallPressed$2 (ContributionManagerUI.java:175) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.Exception: Tool xtensa-esp32-elf-gcc is not available for your operating system. at cc.arduino.contributions.packages.ContributionInstaller.install(ContributionInstaller.java:85) at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onInstallPressed$2 (ContributionManagerUI.java:172) ... 1 more  | 
 - Espressif - ESP32 Forum | Tool xtensa-esp32-elf-gcc is not available for Raspberry Pi (ARM) - Github - Issues espressif/arduino-esp32 | Missing xtensa-esp32-elf when install on Raspberry Pi - Download crosstool-NG and build it: (IDFGH-1566) #3826 - Github - Espressif | Download crosstool-NG and build it: (IDFGH-1566) #3826   | 
- Youtube - Kolban Technical Tutorials | ESP32 - Development environment on PI - Youtube - rdagger68 | ESP32 MicroPython Tutorial with Raspberry Pi - - - - -  |