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-rw-r--r--driver_tsip.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/driver_tsip.c b/driver_tsip.c
index e6252027..cb30394b 100644
--- a/driver_tsip.c
+++ b/driver_tsip.c
@@ -18,9 +18,12 @@
/* if we insist on C99, then we need this to get M_LN2 from math.h */
/* 500 mean X/Open 1995 */
#define _XOPEN_SOURCE 500
+#endif /* __linux__ */
+
+#if !defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE < 200112L
/* round() needs _POSIX_C_SOURCE >= 200112L */
#define _POSIX_C_SOURCE 200112L
-#endif /* __linux__ */
+#endif
#include <sys/time.h> /* for pselect() */