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diff --git a/src/server/init.c b/src/server/init.c
index 3bbd503..3a83c34 100644
--- a/src/server/init.c
+++ b/src/server/init.c
@@ -1,5 +1,6 @@
 /* src/server/init.c */
 
+#define _POSIX_C_SOURCE 2 /* getopt(), optarg */
 #include "init.h"
 #include <errno.h> /* global errno, EEXIST */
 #include <stddef.h> /* NULL */