===================================================================
RCS file: /cvs/mandoc/test-getsubopt.c,v
retrieving revision 1.3
retrieving revision 1.6
diff -u -p -r1.3 -r1.6
--- mandoc/test-getsubopt.c	2014/08/17 20:53:50	1.3
+++ mandoc/test-getsubopt.c	2018/08/15 14:37:41	1.6
@@ -1,4 +1,4 @@
-/*	$Id: test-getsubopt.c,v 1.3 2014/08/17 20:53:50 schwarze Exp $	*/
+/*	$Id: test-getsubopt.c,v 1.6 2018/08/15 14:37:41 schwarze Exp $	*/
 /*
  * Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  *
@@ -15,12 +15,15 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#if defined(__linux__) || defined(__MINT__)
-#define _GNU_SOURCE /* getsubopt() */
-#endif
-
 #include <stdlib.h>
 
+/*
+ * NetBSD declared this function in the wrong header before August 2018.
+ * No harm is done by allowing that, too:
+ * The only file using it, main.c, also includes unistd.h, anyway.
+ */
+#include <unistd.h>
+
 int
 main(void)
 {
@@ -29,6 +32,6 @@ main(void)
 	char token0[] = "k";
 	char *const tokens[] = { token0, NULL };
 	char *value = NULL;
-	return( ! (0 == getsubopt(&options, tokens, &value)
-	    && value == buf+2 && options == buf+3));
+	return ! (getsubopt(&options, tokens, &value) == 0
+	    && value == buf+2 && options == buf+3);
 }