===================================================================
RCS file: /cvs/mandoc/Attic/test-mmap.c,v
retrieving revision 1.4
retrieving revision 1.6
diff -u -p -r1.4 -r1.6
--- mandoc/Attic/test-mmap.c	2014/01/04 01:11:00	1.4
+++ mandoc/Attic/test-mmap.c	2015/10/06 18:32:20	1.6
@@ -1,8 +1,9 @@
 #include <sys/types.h>
 #include <sys/mman.h>
+#include <stddef.h>
 
 int
 main(void)
 {
-	return(MAP_FAILED != mmap(NULL, 1, PROT_READ, MAP_SHARED, -1, 0));
+	return mmap(NULL, 1, PROT_READ, MAP_SHARED, -1, 0) != MAP_FAILED;
 }