Fixed warning about implicit declaration of function fileno().

diff --git a/test/fuzz/minigzip_fuzzer.c b/test/fuzz/minigzip_fuzzer.c
index a4bd112d3da6fcbd2592c432678dd4346ac1ade2..92ccedc9dcdd5df7ee413132cb45eda81ef7a3f6 100644 (file)
--- a/test/fuzz/minigzip_fuzzer.c
+++ b/test/fuzz/minigzip_fuzzer.c
@@ -12,6 +12,8 @@
  * real thing.
  */
 
+#define _POSIX_SOURCE 1  /* This file needs POSIX for fileno(). */
+
 #include "zbuild.h"
 #ifdef ZLIB_COMPAT
 #  include "zlib.h"