Index: pkgtools/pkg_install/files/add/perform.c
===================================================================
RCS file: /cvsroot/pkgsrc/pkgtools/pkg_install/files/add/perform.c,v
retrieving revision 1.105
diff -u -p -u -r1.105 perform.c
--- pkgtools/pkg_install/files/add/perform.c	2 Sep 2013 10:28:44 -0000	1.105
+++ pkgtools/pkg_install/files/add/perform.c	16 Sep 2013 11:58:24 -0000
@@ -908,8 +908,19 @@ check_platform(struct pkg_task *pkg)
 
 	if (OverrideMachine != NULL)
 		effective_arch = OverrideMachine;
-	else
-		effective_arch = MACHINE_ARCH;
+	else {
+#ifdef __NetBSD__
+		static char machine_arch_buf[sizeof(utsname.machine)];
+		const int mib[2] = { CTL_HW, HW_MACHINE_ARCH };
+		size_t len = sizeof(machine_arch_buf);
+
+		if (sysctl(mib, __arraycount(mib), machine_arch_buf,
+		    &len, NULL, 0) == 0)
+			effective_arch = machine_arch_buf;
+		else
+#endif
+			effective_arch = MACHINE_ARCH;
+	}
 
 	/* If either the OS or arch are different, bomb */
 	if (strcmp(OPSYS_NAME, pkg->buildinfo[BI_OPSYS]) ||