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-rw-r--r--sysdep/unix/io.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/sysdep/unix/io.c b/sysdep/unix/io.c
index c9e6fe1..dc7146f 100644
--- a/sysdep/unix/io.c
+++ b/sysdep/unix/io.c
@@ -7,6 +7,10 @@
* Can be freely distributed and used under the terms of the GNU GPL.
*/
+/* Unfortunately, some glibc versions hide parts of RFC 3542 API
+ if _GNU_SOURCE is not defined. */
+#define _GNU_SOURCE 1
+
#include <stdio.h>
#include <stdlib.h>
#include <time.h>