diff -urNr darktable-3.2.1-orig/src/imageio/format/avif.c darktable-3.2.1/src/imageio/format/avif.c
--- darktable-3.2.1-orig/src/imageio/format/avif.c	2020-08-04 13:51:32.000000000 +0200
+++ darktable-3.2.1/src/imageio/format/avif.c	2020-09-26 00:17:26.541623894 +0200
@@ -23,6 +23,7 @@
 #endif
 
 #include <inttypes.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>