https://buildd.debian.org/status/logs.php?pkg=f3&ver=10.0-1

...
In file included from src/libflow.h:11,
                 from src/libflow.c:15:
src/libflow.c: In function ‘dbuf_get_buf’:
src/libutils.h:32:28: error: ‘_Generic’ selector of type ‘unsigned int’ is not compatible with any association
   32 | #define MIN(a, b) _Generic(1 ? (a) : (b),       \
      |                            ^
src/libflow.c:572:18: note: in expansion of macro ‘MIN’
  572 |         *psize = MIN(*psize, dbuf->len - shift);
      |                  ^~~
make[2]: *** [Makefile:55: build/libflow.o] Error 1