1 files changed, 3 insertions, 0 deletions
diff --git a/call/crc.c b/call/crc.c
index ba17f1c..d3484a0 100644
--- a/call/crc.c
+++ b/call/crc.c
@@ -6,6 +6,9 @@
    created: Mark Wahl DL4YBG 94/01/17
    updated: Mark Wahl DL4YBG 94/01/17
 */
+#define _DEFAULT_SOURCE
+#define _XOPEN_SOURCE
+#define _XOPEN_SOURCE_EXTENDED
 
 #include "crc.h"