There are some breaking API changes related to watchdog functionality in the recently released 3.x.x branch of arduino-esp32.

The Interrupt Watchdog API (functions/types/macros prefixed with esp_int_wdt_) has been made into a private API. Thus, the previous include path #include "esp_int_wdt.h" has been removed. If users still require usage of the Interrupt Watchdog API (though this is not recommended), it can be included via #include "esp_private/esp_int_wdt.h".

So you're probably going to need to update esp32-cam-webserver.ino and app_httpd.cpp with something like:

#if ESP_ARDUINO_VERSION_MAJOR >= 3 #include "esp_private/esp_int_wdt.h" #else #include "esp_int_wdt.h" #endif 

The API for esp_task_wdt_init() has changed as follows:

• Configuration is now passed as a configuration structure.
• The function will now handle subscribing of the idle tasks if configured to do so.

• https://docs.espressif.com/projects/esp-idf/en/release-v5.1/esp32/migration-guides/release-5.x/5.0/system.html
• https://github.com/espressif/arduino-esp32/blob/master/docs/en/migration_guides/2.x_to_3.0.rst#migration-from-2x-to-30