Compilation error dtostrf

Hardware MKR Family MKRFOX1200
2

Not an expert for samd but I found this via Google:

#include <avr/dtostrf.h>

Sources:

dtostrf is not available for ARM Cortex M4 (but should be by default) · Issue #9308 · arduino/Arduino (github.com)

dtostrf function not working in Arduino Zero - Hardware / Arduino Zero - Arduino Forum

Test sketch from (https://github.com/esp8266/Arduino/issues/6695)

#include <avr/dtostrf.h>

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  delay(1000);
  Serial.println();
  
  float f=1234.567;
  char s[20]="";
  dtostrf(f,8,3,s);
  Serial.println(f);
  Serial.println(s);
  Serial.println();
  
}

void loop() {
  // put your main code here, to run repeatedly:

}

Good luck!