$NetBSD$

NetBSD has getpagesize(3) in unistd.h

--- src/gmalloc.c.orig	2010-10-12 20:51:26.000000000 +0400
+++ src/gmalloc.c	2010-11-19 02:51:35.000000000 +0300
@@ -1657,7 +1657,11 @@
 extern size_t __getpagesize PP ((void));
 #endif
 #else
+#if defined (__NetBSD__) || defined (__DragonFly__)
+extern int getpagesize (void); /* from getpagesize(3) */
+#else
 #include "getpagesize.h"
+#endif
 #define	 __getpagesize()	getpagesize()
 #endif
 
