Extend feature test macro

Defining _POSIX_C_SOURCE=200809L fixes compilation currently under
Net/Open/MirBSD (and possibly more).

1 files changed, 1 insertions, 1 deletions

diff --git a/colorize.c b/colorize.c
index 827de87..7bb8ee0 100644
--- a/colorize.c
+++ b/colorize.c
@@ -19,7 +19,7 @@
  *
  */
 
-#define _POSIX_SOURCE
+#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <ctype.h>
 #include <errno.h>