Ivan Grokhotkov

cc @brianignacio5

Have ran into the same issue, seems like the setting has changed from https://github.com/espressif/arduino-esp32/blob/a6df1f5e7cca9a81095937d58599a29d791ef878/tools/sdk/esp32/sdkconfig#L777 to https://github.com/espressif/esp32-arduino-libs/blob/a6dac936bfcfa4c11468e003f550b41c76efeae6/esp32/sdkconfig#L1086

> I also do not know of another board with 26MHz crystal In my case it was with Heltec Lora boards, they used to come with 26 MHz XTALs. Unfortunately...

Hi @projectgus! This has been reported in upstream last year (https://sourceware.org/pipermail/newlib/2023/020171.html), but no fix there so far. We'll see if we can come up with a fix for this.